Khan Academy Class 9 Math Videos and Exercises (NCERT)

Math Videos:

Number systems
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems#xfd53e0255cd302f8:number-systems

Intro to rational & irrational numbers
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:irrational-numbers/v/introduction-to-rational-and-irrational-numbers
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:number-systems/x88ae7e372100d2cd:irrational-numbers/v/intro-to-rational-irrational-numbers-hindi

Classifying numbers
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:irrational-numbers/v/categorizing-numbers
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:number-systems/x88ae7e372100d2cd:irrational-numbers/v/classifying-numbers-hindi

Converting a fraction to a repeating decimal
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:real-numbers-and-their-decimal-expansions/v/converting-a-fraction-to-a-repeating-decimal
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:number-systems/x88ae7e372100d2cd:real-numbers-and-their-decimal-expansions/v/converting-a-fraction-to-a-repeating-decimal-hindi

Converting repeating decimals to fractions (part 1 of 2)
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:real-numbers-and-their-decimal-expansions/v/coverting-repeating-decimals-to-fractions-1
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:number-systems/x88ae7e372100d2cd:real-numbers-and-their-decimal-expansions/v/converting-repeating-decimals-to-fractions-part-1-of-2-hindi

Converting repeating decimals to fractions (part 2 of 2)
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:real-numbers-and-their-decimal-expansions/v/coverting-repeating-decimals-to-fractions-2
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:number-systems/x88ae7e372100d2cd:real-numbers-and-their-decimal-expansions/v/converting-repeating-decimals-to-fractions-part-2-of-2-hindi

Sums and products of irrational numbers
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:operations-on-real-numbers/v/sums-and-products-of-irrational-numbers
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:number-systems/x88ae7e372100d2cd:operations-on-real-numbers/v/sums-and-products-of-irrational-numbers-hindi

Worked example: rational vs. irrational expressions
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:operations-on-real-numbers/v/recognizing-rational-and-irrational-expressions-example
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:number-systems/x88ae7e372100d2cd:operations-on-real-numbers/v/worked-example-rational-vs-irrational-expressions-hindi

Intro to rational exponents
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:laws-of-exponents-for-real-numbers/v/basic-fractional-exponents
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:number-systems/x88ae7e372100d2cd:laws-of-exponents-for-real-numbers/v/intro-to-rational-exponents-hindi

Rewriting roots as rational exponents
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:laws-of-exponents-for-real-numbers/v/rewriting-roots-as-rational-exponents
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:number-systems/x88ae7e372100d2cd:laws-of-exponents-for-real-numbers/v/rewriting-roots-as-rational-exponents-hindi

Evaluating fractional exponents
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:laws-of-exponents-for-real-numbers/v/fractional-exponents-with-numerators-other-than-1
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:number-systems/x88ae7e372100d2cd:laws-of-exponents-for-real-numbers/v/evaluating-fractional-exponents-hindi

Polynomials
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials#xfd53e0255cd302f8:polynomials

Polynomials intro
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:polynomials-in-one-variable/v/polynomials-intro
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:polynomials/x88ae7e372100d2cd:polynomials-in-one-variable/v/polynomials-intro-hindi

Evaluating polynomials
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:zeroes-of-a-polynomial/v/evaluating-a-polynomial-at-a-given-value
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:polynomials/x88ae7e372100d2cd:zeroes-of-a-polynomial/v/evaluating-polynomials-hindi

Polynomial factors and graphs — Basic example
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:zeroes-of-a-polynomial/v/sat-math-p11-easier

Intro to the Polynomial Remainder Theorem
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:remainder-theorem/v/polynomial-remainder-theorem

Remainder theorem: checking factors
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:remainder-theorem/v/polynomial-remainder-theorem-to-test-factor

Which monomial factorization is correct?
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:factorisation-of-polynomials/v/ways-to-factor-a-monomial
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:polynomials/x88ae7e372100d2cd:factorisation-of-polynomials/v/monomial-factorisation-hindi

Perfect square factorization intro
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:factorisation-of-polynomials/v/perfect-square-factorization-intro
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:polynomials/x88ae7e372100d2cd:factorisation-of-polynomials/v/perfect-square-factorization-intro-hindi

Multiplying monomials by polynomials
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:multiplying-polynomials/v/multiplying-monomials-by-polynomials
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:polynomials/x88ae7e372100d2cd:multiplying-polynomials/v/multiplying-monomials-by-polynomials-hindi

Multiplying binomials by polynomials
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:multiplying-polynomials/v/more-multiplying-polynomials
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:polynomials/x88ae7e372100d2cd:multiplying-polynomials/v/multiplying-binomials-by-polynomials-hindi

Special products of the form (ax+b)(ax-b)
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:standard-identities/v/special-polynomials-products-1
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:polynomials/x88ae7e372100d2cd:standard-identities/v/special-products-of-the-form-axbax-b-hindi

Squaring binomials of the form (ax+b)²
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:standard-identities/v/square-a-binomial
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:polynomials/x88ae7e372100d2cd:standard-identities/v/squaring-binomials-of-the-form-axb-hindi

Special products of binomials: two variables
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:standard-identities/v/special-products-of-polynomials-2
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:polynomials/x88ae7e372100d2cd:standard-identities/v/special-products-of-binomials-two-variables-hindi

Coordinate geometry
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:coordinate-geometry#xfd53e0255cd302f8:coordinate-geometry

Introduction to the coordinate plane
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:coordinate-geometry/xfd53e0255cd302f8:cartesian-system/v/introduction-to-the-coordinate-plane
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:coordinate-geometry/x88ae7e372100d2cd:cartesian-system/v/introduction-to-the-coordinate-plane-hindi

Points and quadrants example
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:coordinate-geometry/xfd53e0255cd302f8:cartesian-system/v/graphing-points-and-naming-quadrants-exercise
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:coordinate-geometry/x88ae7e372100d2cd:cartesian-system/v/points-and-quadrants-example-hindi

Finding the point not graphed
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:coordinate-geometry/xfd53e0255cd302f8:plotting-points-on-cartesian-plane/v/points-on-the-coordinate-plane
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:coordinate-geometry/x88ae7e372100d2cd:plotting-points-on-cartesian-plane/v/finding-the-point-not-graphed-hindi

Linear equations in two variables
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:linear-equations-in-two-variables#xfd53e0255cd302f8:linear-equations-in-two-variables

Worked example: solutions to 2-variable equations
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:linear-equations-in-two-variables/xfd53e0255cd302f8:solutions-of-a-linear-equation/v/checking-ordered-pair-solutions-to-equations-2
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:linear-equations-in-two-variables/x88ae7e372100d2cd:solutions-of-a-linear-equation/v/worked-example-solutions-to-2-variable-equations-hindi

Completing solutions to 2-variable equations
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:linear-equations-in-two-variables/xfd53e0255cd302f8:solutions-of-a-linear-equation/v/graphing-solutions-to-2-variable-linear-equations-1
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:linear-equations-in-two-variables/x88ae7e372100d2cd:solutions-of-a-linear-equation/v/completing-solutions-to-2-variable-equations-hindi

Graphing a linear equation: 5x+2y=20
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:linear-equations-in-two-variables/xfd53e0255cd302f8:graph-of-a-linear-equation-in-two-variables/v/plotting-x-y-relationships
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:linear-equations-in-two-variables/x88ae7e372100d2cd:graph-of-a-linear-equation-in-two-variables/v/graphing-a-linear-equation-5x2y20-hindi

Graphing a linear equation: y=2x+7
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:linear-equations-in-two-variables/xfd53e0255cd302f8:graph-of-a-linear-equation-in-two-variables/v/graphs-of-linear-equations
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:linear-equations-in-two-variables/x88ae7e372100d2cd:graph-of-a-linear-equation-in-two-variables/v/graphing-a-linear-equation-y2x7-hindi

Lines and angles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles#xfd53e0255cd302f8:lines-and-angles

Complementary & supplementary angles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles/xfd53e0255cd302f8:pairs-of-angles/v/complementary-and-supplementary-angles
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:lines-and-angles/x88ae7e372100d2cd:pairs-of-angles/v/complementary-supplementary-angles-hindi

Vertical angles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles/xfd53e0255cd302f8:pairs-of-angles/v/angles-at-the-intersection-of-two-lines
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:lines-and-angles/x88ae7e372100d2cd:pairs-of-angles/v/vertical-angles-hindi

Angles, parallel lines, & transversals
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles/xfd53e0255cd302f8:parallel-lines-and-a-transversal/v/angles-formed-by-parallel-lines-and-transversals
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:lines-and-angles/x88ae7e372100d2cd:parallel-lines-and-a-transversal/v/angles-parallel-lines-transversals-hindi

Missing angles with a transversal
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles/xfd53e0255cd302f8:parallel-lines-and-a-transversal/v/figuring-out-angles-between-transversal-and-parallel-lines
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:lines-and-angles/x88ae7e372100d2cd:parallel-lines-and-a-transversal/v/missing-angles-with-a-transversal-hindi

Triangle exterior angle example
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles/xfd53e0255cd302f8:angle-sum-property-of-a-triangle/v/triangle-angle-example-1
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:lines-and-angles/x88ae7e372100d2cd:angle-sum-property-of-a-triangle/v/triangle-exterior-angle-example-hindi

Vertical angles are congruent proof
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles/xfd53e0255cd302f8:proofs-lines-and-angles/v/proof-vertical-angles-are-equal
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:lines-and-angles/x88ae7e372100d2cd:proofs-lines-and-angles/v/vertical-angles-are-congruent-proof-hindi

Parallel lines & corresponding angles proof
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles/xfd53e0255cd302f8:proofs-lines-and-angles/v/proof-corresponding-angle-equivalence-implies-parallel-lines

Proving angles are congruent
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles/xfd53e0255cd302f8:proofs-lines-and-angles/v/showing-angles-have-same-measure

Angles in a triangle sum to 180° proof
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles/xfd53e0255cd302f8:proofs-lines-and-angles/v/proof-sum-of-measures-of-angles-in-a-triangle-are-180
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:lines-and-angles/x88ae7e372100d2cd:proofs-lines-and-angles/v/angles-in-a-triangle-sum-to-180-proof-hindi

Triangles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles#xfd53e0255cd302f8:triangles

Intro to medians of a triangle
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:triangles-review/v/intro-to-medians-of-a-triangle-class-7-india-math-khan-academy

Angles in a triangle sum to 180° proof
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:triangles-review/v/proof-sum-of-measures-of-angles-in-a-triangle-are-180
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:triangles/x88ae7e372100d2cd:triangles-review/v/angles-in-a-triangle-sum-to-180-proof-hindi

Triangle angle challenge problem 2
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:triangles-review/v/finding-more-angles
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:triangles/x88ae7e372100d2cd:triangles-review/v/triangle-angle-challenge-problem-2-hindi

Intro to the Pythagorean theorem
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:pythagorean-theorem/v/the-pythagorean-theorem
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:triangles/x88ae7e372100d2cd:pythagorean-theorem/v/intro-to-the-pythagoras-theorem-hindi

Pythagorean theorem example
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:pythagorean-theorem/v/pythagorean-theorem-2
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:triangles/x88ae7e372100d2cd:pythagorean-theorem/v/pythagorean-theorem-example-hindi

Triangle congruence postulates/criteria
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:criteria-for-congruence-of-triangles/v/other-triangle-congruence-postulates
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:triangles/x88ae7e372100d2cd:criteria-for-congruence-of-triangles/v/triangle-congruence-postulatescriteria-hindi

Why SSA isn't a congruence postulate/criterion
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:criteria-for-congruence-of-triangles/v/more-on-why-ssa-is-not-a-postulate
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:triangles/x88ae7e372100d2cd:criteria-for-congruence-of-triangles/v/why-ssa-isnt-a-congruence-criterion-hindi

Proofs concerning isosceles triangles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:proofs-triangles/v/congruent-legs-and-base-angles-of-isosceles-triangles
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:triangles/x88ae7e372100d2cd:proofs-triangles/v/proofs-concerning-isosceles-triangles-hindi

Proofs concerning equilateral triangles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:proofs-triangles/v/equilateral-triangle-sides-and-angles-congruent
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:triangles/x88ae7e372100d2cd:proofs-triangles/v/proofs-concerning-equilateral-triangles-hindi

Geometry proof problem: midpoint
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:proofs-triangles/v/congruent-triangle-proof-example
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:triangles/x88ae7e372100d2cd:proofs-triangles/v/geometry-proof-problem-midpoint-hindi

Geometry proof problem: congruent segments
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:proofs-triangles/v/congruent-triangle-example-2
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:triangles/x88ae7e372100d2cd:proofs-triangles/v/geometry-proof-problem-congruent-segments-hindi

Geometry proof problem: squared circle
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:proofs-triangles/v/problem-involving-angle-derived-from-square-and-circle
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:triangles/x88ae7e372100d2cd:proofs-triangles/v/geometry-proof-problem-squared-circle-hindi

Triangle inequality theorem
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:inequalities-in-a-triangle/v/triangle-inqequality-theorem
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:triangles/x88ae7e372100d2cd:inequalities-in-a-triangle/v/triangle-inequality-theorem-hindi

Ordering triangle sides and angles example
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:inequalities-in-a-triangle/v/ordering-triangle-sides-and-angles

Quadrilaterals
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:quadrilaterals#xfd53e0255cd302f8:quadrilaterals

Intro to quadrilateral
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:quadrilaterals/xfd53e0255cd302f8:kinds-of-quadrilaterals/v/quadrilateral-overview
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:quadrilaterals/x88ae7e372100d2cd:kinds-of-quadrilaterals/v/intro-to-quadrilateral-hindi

Quadrilateral types
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:quadrilaterals/xfd53e0255cd302f8:kinds-of-quadrilaterals/v/quadrilateral-types-exercise
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:quadrilaterals/x88ae7e372100d2cd:kinds-of-quadrilaterals/v/quadrilateral-types-hindi

Proof: Opposite sides of a parallelogram
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:quadrilaterals/xfd53e0255cd302f8:proofs-parallelograms/v/proof-opposite-sides-of-parallelogram-congruent
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:quadrilaterals/x88ae7e372100d2cd:proofs-parallelograms/v/proof-opposite-sides-of-a-parallelogram-are-equal-hindi

Proof: Opposite angles of a parallelogram
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:quadrilaterals/xfd53e0255cd302f8:proofs-parallelograms/v/proof-opposite-angles-of-parallelogram-congruent
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:quadrilaterals/x88ae7e372100d2cd:proofs-parallelograms/v/proof-opposite-angles-of-a-parallelogram-hindi

Proof: Diagonals of a parallelogram
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:quadrilaterals/xfd53e0255cd302f8:proofs-parallelograms/v/proof-diagonals-of-a-parallelogram-bisect-each-other
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:quadrilaterals/x88ae7e372100d2cd:proofs-parallelograms/v/proof-diagonals-of-a-parallelogram-bisect-each-other-hindi

Proof: Rhombus diagonals are perpendicular bisectors
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:quadrilaterals/xfd53e0255cd302f8:proofs-rhombus/v/proof-rhombus-diagonals-are-perpendicular-bisectors
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:quadrilaterals/x88ae7e372100d2cd:proofs-rhombus/v/proof-rhombus-diagonals-are-perpendicular-bisectors-hindi

Rhombus diagonals
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:quadrilaterals/xfd53e0255cd302f8:proofs-rhombus/v/rhombus-diagonals
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:quadrilaterals/x88ae7e372100d2cd:proofs-rhombus/v/rhombus-diagonals-hindi

Proof: Rhombus area
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:quadrilaterals/xfd53e0255cd302f8:proofs-rhombus/v/proof-rhombus-area-half-product-of-diagonal-length

Kites as a geometric shape
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:quadrilaterals/xfd53e0255cd302f8:proofs-kite/v/kites-as-a-mathematical-shape

Proof: The diagonals of a kite are perpendicular
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:quadrilaterals/xfd53e0255cd302f8:proofs-kite/v/two-column-proof-showing-segments-are-perpendicular

Areas of parallelograms and triangles (reduced)
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:areas-of-parallelograms-and-triangles#xfd53e0255cd302f8:areas-of-parallelograms-and-triangles

Area of a parallelogram
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:areas-of-parallelograms-and-triangles/xfd53e0255cd302f8:area-of-a-parallelogram/v/intuition-for-area-of-a-parallelogram
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:areas-of-parallelograms-and-triangles/x88ae7e372100d2cd:area-of-a-parallelogram/v/area-of-parallelogram-hindi

Area of parallelogram proof
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:areas-of-parallelograms-and-triangles/xfd53e0255cd302f8:area-of-a-parallelogram/v/area-of-a-parallelogram

Area of a triangle
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:areas-of-parallelograms-and-triangles/xfd53e0255cd302f8:area-of-a-triangle/v/intuition-for-area-of-a-triangle
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:areas-of-parallelograms-and-triangles/x88ae7e372100d2cd:area-of-a-triangle/v/area-of-triangle-hindi

Area of triangle proof
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:areas-of-parallelograms-and-triangles/xfd53e0255cd302f8:area-of-a-triangle/v/triangle-area-proofs
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:areas-of-parallelograms-and-triangles/x88ae7e372100d2cd:area-of-a-triangle/v/area-of-triangle-proof-hindi

Circles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:circles#xfd53e0255cd302f8:circles

Circles glossary
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:circles/xfd53e0255cd302f8:circles-and-its-related-terms/v/language-and-notation-of-the-circle
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:circles/x88ae7e372100d2cd:circles-and-its-related-terms/v/circles-glossary-hindi

Radius, diameter, circumference & π
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:circles/xfd53e0255cd302f8:circles-and-its-related-terms/v/circles-radius-diameter-and-circumference
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:circles/x88ae7e372100d2cd:circles-and-its-related-terms/v/radius-diameter-circumference-hindi

Proof: all circles are similar
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:circles/xfd53e0255cd302f8:circles-and-its-related-terms/v/seeing-circle-similarity-through-translation-and-dilation
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:circles/x88ae7e372100d2cd:circles-and-its-related-terms/v/proof-all-circles-are-similar-hindi

Inscribed angles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:circles/xfd53e0255cd302f8:angle-subtended-by-a-chord-arc-of-a-circle/v/inscribed-angles-exercise-example
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:circles/x88ae7e372100d2cd:angle-subtended-by-a-chord-arc-of-a-circle/v/inscribed-angles-hindi

Inscribed angle theorem proof
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:circles/xfd53e0255cd302f8:angle-subtended-by-a-chord-arc-of-a-circle/v/inscribed-and-central-angles
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:circles/x88ae7e372100d2cd:angle-subtended-by-a-chord-arc-of-a-circle/v/inscribed-angle-theorem-proof-hindi

Proof: radius is perpendicular to a chord it bisects
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:circles/xfd53e0255cd302f8:perpendicular-from-the-centre-to-a-chord/v/sss-to-show-a-radius-is-perpendicular-to-a-chord-that-it-bisects
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:circles/x88ae7e372100d2cd:perpendicular-from-the-centre-to-a-chord/v/line-drawn-from-centre-perpendicular-to-chord-bisects-the-chord-hindi

Proof: perpendicular radius bisects chord
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:circles/xfd53e0255cd302f8:perpendicular-from-the-centre-to-a-chord/v/perpendicular-radius-bisects-chord
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:circles/x88ae7e372100d2cd:perpendicular-from-the-centre-to-a-chord/v/perpendicular-from-centre-of-circle-to-chord-bisects-the-chord-hindi

Inscribed quadrilaterals proof
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:circles/xfd53e0255cd302f8:cyclic-quadrilaterals/v/proving-the-opposite-angles-of-inscribed-quadrilateral-are-supplementary
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:circles/x88ae7e372100d2cd:cyclic-quadrilaterals/v/inscribed-quadrilaterals-proof-hindi

Solving inscribed quadrilaterals
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:circles/xfd53e0255cd302f8:cyclic-quadrilaterals/v/example-showing-supplementary-oppositie-angles-in-inscribed-quadrilateral
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:circles/x88ae7e372100d2cd:cyclic-quadrilaterals/v/solving-inscribed-quadrilaterals-hindi

Proof: Right triangles inscribed in circles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:circles/xfd53e0255cd302f8:inscribed-shapes-problem-solving/v/right-triangles-inscribed-in-circles-proof
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:circles/x88ae7e372100d2cd:inscribed-shapes-problem-solving/v/proof-right-triangles-inscribed-in-circles-hindi

Inscribed shapes: find diameter
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:circles/xfd53e0255cd302f8:inscribed-shapes-problem-solving/v/hypotenuse-of-right-triangle-inscribed-in-circle
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:circles/x88ae7e372100d2cd:inscribed-shapes-problem-solving/v/inscribed-shapes-find-diameter-hindi

Inscribed shapes: angle subtended by diameter
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:circles/xfd53e0255cd302f8:inscribed-shapes-problem-solving/v/solving-for-unknown-angle
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:circles/x88ae7e372100d2cd:inscribed-shapes-problem-solving/v/inscribed-shapes-angle-subtended-by-diameter-hindi

Inscribed shapes: find inscribed angle
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:circles/xfd53e0255cd302f8:inscribed-shapes-problem-solving/v/finding-inscribed-angle-measure
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:circles/x88ae7e372100d2cd:inscribed-shapes-problem-solving/v/inscribed-shapes-find-inscribed-angle-hindi

Surface areas and volumes
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:surface-areas-and-volumes#xfd53e0255cd302f8:surface-areas-and-volumes

Heron's formula
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:surface-areas-and-volumes/xfd53e0255cd302f8:herons-formula/v/heron-s-formula
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:surface-areas-and-volumes/x88ae7e372100d2cd:heron-s-formula/v/herons-formula-hindi

Surface area of a box (cuboid)
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:surface-areas-and-volumes/xfd53e0255cd302f8:cube-cuboid-and-cylinder/v/surface-area-of-a-box
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:surface-areas-and-volumes/x88ae7e372100d2cd:cube-cuboid-and-cylinder/v/surface-area-of-a-box-cuboid-hindi

Volume of a rectangular prism
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:surface-areas-and-volumes/xfd53e0255cd302f8:cube-cuboid-and-cylinder/v/volume-of-a-rectangular-prism-or-box-examples
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:surface-areas-and-volumes/x88ae7e372100d2cd:cube-cuboid-and-cylinder/v/volume-of-rectangular-prism-hindi

Cylinder volume & surface area
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:surface-areas-and-volumes/xfd53e0255cd302f8:cube-cuboid-and-cylinder/v/cylinder-volume-and-surface-area
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:surface-areas-and-volumes/x88ae7e372100d2cd:cube-cuboid-and-cylinder/v/cylinder-surface-area-hindi

https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:surface-areas-and-volumes/x88ae7e372100d2cd:cube-cuboid-and-cylinder/v/cylinder-volume-hindi

Volume of a cone
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:surface-areas-and-volumes/xfd53e0255cd302f8:cones-and-spheres/v/volume-cone-example
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:surface-areas-and-volumes/x88ae7e372100d2cd:cones-and-shperes/v/volume-of-a-cone-hindi

Volume of a sphere
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:surface-areas-and-volumes/xfd53e0255cd302f8:cones-and-spheres/v/volume-of-a-sphere
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:surface-areas-and-volumes/x88ae7e372100d2cd:cones-and-shperes/v/volume-of-a-sphere-hindi

Statistics
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:statistics#xfd53e0255cd302f8:statistics

Reading bar charts: comparing two sets of data
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:statistics/xfd53e0255cd302f8:bar-graphs/v/reading-bar-charts-2

Creating a bar graph
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:statistics/xfd53e0255cd302f8:bar-graphs/v/creating-bar-charts-1
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:statistics/x88ae7e372100d2cd:bar-graphs/v/creating-picture-and-bar-graphs-hindi

Interpreting a histogram
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:statistics/xfd53e0255cd302f8:histograms/v/interpreting-histograms

Creating a histogram
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:statistics/xfd53e0255cd302f8:histograms/v/histograms-intro

Statistics intro: Mean, median, & mode
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:statistics/xfd53e0255cd302f8:mean-median-mode-range/v/statistics-intro-mean-median-and-mode
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:statistics/x88ae7e372100d2cd:mean-median-mode-range/v/statistics-intro-mean-median-mode-hindi

Mean, median, & mode example
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:statistics/xfd53e0255cd302f8:mean-median-mode-range/v/mean-median-and-mode
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:statistics/x88ae7e372100d2cd:mean-median-mode-range/v/mean-median-mode-example-hindi

Reading bar charts: putting it together with central tendency
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:statistics/xfd53e0255cd302f8:mean-median-mode-range/v/reading-bar-charts-3

Probability
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:probability#xfd53e0255cd302f8:probability

Experimental probability
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:probability/xfd53e0255cd302f8:experimental-probability/v/experimental-probability
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:probability/x88ae7e372100d2cd:experimental-probability/v/experimental-probability-hindi

Making predictions with probability
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:probability/xfd53e0255cd302f8:probability-problems/v/making-predictions-with-probability
https://www.khanacademy.org/math/in-in-class-9-math-india-hindi/x88ae7e372100d2cd:probability/x88ae7e372100d2cd:probability-problems/v/making-predictions-with-probability-hindi

...........................................................................
Math Exercises:

Number systems
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems#xfd53e0255cd302f8:number-systems

Classify numbers: rational & irrational
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:irrational-numbers/e/recognizing-rational-and-irrational-numbers Exercise 1.3

Classify numbers
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:irrational-numbers/e/identifying-whole--integer--and-rational-numbers Exercise 1.3

Identifying decimal expansion of rational and irrational numbers
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:irrational-numbers/e/identifying-decimal-expansion-of-rational-numbers Exercise 1.3

Writing fractions as repeating decimals
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:real-numbers-and-their-decimal-expansions/e/writing-fractions-as-repeating-decimals Exercise 1.3

Converting repeating decimals to fractions
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:real-numbers-and-their-decimal-expansions/e/converting_repeating_decimals_to_fractions_1 Exercise 1.3

Converting multi-digit repeating decimals to fractions
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:real-numbers-and-their-decimal-expansions/e/converting_repeating_decimals_to_fractions_2 Exercise 1.3

Rational vs. irrational expressions
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:operations-on-real-numbers/e/recognizing-rational-and-irrational-expressions Exercise 1.5

Adding and subtracting irrational numbers
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:operations-on-real-numbers/e/adding-and-subtracting-irrational-numbers Exercise 1.5

Multiplying and dividing irrational numbers
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:simplifying-expressions/e/multiplying-irrational-numbers Exercise 1.5

Multiplying irrational expressions
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:simplifying-expressions/e/multiplying-and-dividing-irrational-numbers Exercise 1.5

Rationalising the denominator (basic)
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:simplifying-expressions/e/rationalising-the-denominator-basic Exercise 1.5

Rationalising the denominator (advanced)
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:simplifying-expressions/e/rationalising-the-denominator Exercise 1.5

Unit-fraction exponents
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:laws-of-exponents-for-real-numbers/e/understanding-fractional-exponents Exercise 1.6

Fractional exponents
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:laws-of-exponents-for-real-numbers/e/exponents_3 Exercise 1.6

Evaluate radical expressions challenge
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/xfd53e0255cd302f8:laws-of-exponents-for-real-numbers/e/simplify-radicals-and-exponentials Exercise 1.6 (Board level)

Unit test on Number systems
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:number-systems/test/xfd53e0255cd302f8:number-systems-unit-test?modal=1 Chapter Assessment

Polynomials
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials#xfd53e0255cd302f8:polynomials

Polynomials intro
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:polynomials-in-one-variable/e/polynomials-intro Exercise 2.1

Finding terms and coefficients of a polynomial
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:polynomials-in-one-variable/e/terms-of-a-polynomial Exercise 2.1

Classify polynomials based on degree
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:polynomials-in-one-variable/e/types-of-polynomial-1 Exercise 2.1

Classify polynomials based on terms
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:polynomials-in-one-variable/e/types-of-polynomial-2 Exercise 2.1

Finding value of a polynomial
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:zeroes-of-a-polynomial/e/value-of-a-polynomial Exercise 2.2

Zeros of polynomial (intermediate)
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:zeroes-of-a-polynomial/e/zeros-of-a-polynomial-in Exercise 2.2

Remainder theorem
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:remainder-theorem/e/remainder-theorem-of-polynomials Exercise 2.3

Factors of a polynomial (basic)
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:factorisation-of-polynomials/e/factors-of-a-polynomial--basic- Exercise 2.4

Factors of a polynomial (advanced)
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:factorisation-of-polynomials/e/factors-of-a-polynomial--advanced- Exercise 2.4

Multiply binomials
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:multiplying-polynomials/e/multiply-binomials-coefficient Exercise 2.5

Multiply binomials by polynomials
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:multiplying-polynomials/e/multiplying_polynomials Exercise 2.5

Polynomial special products: perfect square
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:standard-identities/e/finding-special-products Exercise 2.5

Identities (basic)
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:algebraic-identities/e/identities--basic- Exercise 2.5

Factorising using identities
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:algebraic-identities/e/factorising-using-identities Exercise 2.5

Multiplying numbers using identities
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/xfd53e0255cd302f8:algebraic-identities/e/multiplying-numbers-using-identities Exercise 2.5

Unit test on Polynomials
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:polynomials/test/xfd53e0255cd302f8:polynomials-unit-test?modal=1 Chapter Assessment

Coordinate geometry
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:coordinate-geometry#xfd53e0255cd302f8:coordinate-geometry

Cartesian plane nomenclature
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:coordinate-geometry/xfd53e0255cd302f8:cartesian-system/e/exercise-on-nomenclature-9th Exercise 3.2

Quadrants on the coordinate plane
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:coordinate-geometry/xfd53e0255cd302f8:cartesian-system/e/graphing_points_2 Exercise 3.2

Points on the coordinate plane
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:coordinate-geometry/xfd53e0255cd302f8:plotting-points-on-cartesian-plane/e/identifying_points_1 Exercise 3.3

Unit test on Coordinate geometry
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:coordinate-geometry/test/xfd53e0255cd302f8:coordinate-geometry-unit-test?modal=1 Chapter Assessment

Linear equations in two variables
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:linear-equations-in-two-variables#xfd53e0255cd302f8:linear-equations-in-two-variables

Solutions to 2-variable equations
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:linear-equations-in-two-variables/xfd53e0255cd302f8:solutions-of-a-linear-equation/e/plugging_in_values Exercise 4.2

Complete solutions to 2-variable equations
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:linear-equations-in-two-variables/xfd53e0255cd302f8:solutions-of-a-linear-equation/e/graphing-solutions-to-two-variable-linear-equations Exercise 4.2

Graph from linear standard form
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:linear-equations-in-two-variables/xfd53e0255cd302f8:graph-of-a-linear-equation-in-two-variables/e/graph-from-standard-form-equation Exercise 4.3

Plotting horizontal and vertical lines
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:linear-equations-in-two-variables/xfd53e0255cd302f8:graph-of-a-linear-equation-in-two-variables/e/plotting-horizontal-and-vertical-lines Exercise 4.4

Unit test on Linear equations in two variables
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:linear-equations-in-two-variables/test/xfd53e0255cd302f8:linear-equations-in-two-variables-unit-test?modal=1 Chapter Assessment

Lines and angles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles#xfd53e0255cd302f8:lines-and-angles

Identifying supplementary, complementary, and vertical angles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles/xfd53e0255cd302f8:pairs-of-angles/e/identifying-supplementary-complementary-vertical Exercise 6.1

Complementary and supplementary angles (visual)
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles/xfd53e0255cd302f8:pairs-of-angles/e/complementary_and_supplementary_angles Exercise 6.1

Linear pair and vertically opposite angles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles/xfd53e0255cd302f8:pairs-of-angles/e/linear-pair--vertically-opposite-9th Exercise 6.1

Angle relationships with parallel lines
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles/xfd53e0255cd302f8:parallel-lines-and-a-transversal/e/parallel_lines_1 Exercise 6.2

Equation practice with angles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles/xfd53e0255cd302f8:parallel-lines-and-a-transversal/e/parallel_lines_2 Exercise 6.2

Solving angles formed by parallel lines and transversal
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles/xfd53e0255cd302f8:lines-parallel-to-the-same-line/e/transversal-9th Exercise 6.2

Finding angle measures using triangles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles/xfd53e0255cd302f8:lines-parallel-to-the-same-line/e/angles_2 Exercise 6.2

Find angles in triangles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles/xfd53e0255cd302f8:angle-sum-property-of-a-triangle/e/triangle_angles_1 Exercise 6.3

Triangle exterior angle property problems
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles/xfd53e0255cd302f8:angle-sum-property-of-a-triangle/e/exterior-angle-property-problems Exercise 6.3

Unit test on Lines and angles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:lines-and-angles/test/xfd53e0255cd302f8:lines-and-angles-unit-test?modal=1 Chapter Assessment

Triangles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles#xfd53e0255cd302f8:triangles

Identify medians and altitudes
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:triangles-review/e/identify-median-and-altitude

Triangle exterior angle property problems
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:triangles-review/e/exterior-angle-property-problems

Finding angle measures using triangles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:triangles-review/e/angles_2

Use Pythagoras theorem to find side lengths of right triangle
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:pythagorean-theorem/e/pythagorean_theorem_1

Right triangle side lengths
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:pythagorean-theorem/e/right-triangle-side-lengths

Use area of squares to visualize Pythagoras theorem
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:pythagorean-theorem/e/use-area-of-squares-to-visualize-pythagorean-theorem

Determine congruent triangles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:criteria-for-congruence-of-triangles/e/congruent_triangles_1 Exercise 7.1

(proof questions excluded)
Find angles in congruent triangles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:criteria-for-congruence-of-triangles/e/congruent_triangles_2 Exercise 7.1

(proof questions excluded)
Triangle side length rules
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:inequalities-in-a-triangle/e/triangle_inequality_theorem Exercise 7.4

(proof questions excluded)
Ordering triangle sides and angles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/xfd53e0255cd302f8:inequalities-in-a-triangle/e/triangle-angles-and-opposite-sides Exercise 7.4

(proof questions excluded)
Unit test on Triangles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:triangles/test/xfd53e0255cd302f8:triangles-unit-test?modal=1 Chapter Assessment

Quadrilaterals
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:quadrilaterals#xfd53e0255cd302f8:quadrilaterals

Analyze quadrilaterals
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:quadrilaterals/xfd53e0255cd302f8:kinds-of-quadrilaterals/e/categorize-quadrilaterals Exercise 8.1 (pre-requisite)

Quadrilateral types
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:quadrilaterals/xfd53e0255cd302f8:kinds-of-quadrilaterals/e/quadrilateral_types Exercise 8.1 (pre-requisite)

Side and angle properties of a parallelogram (level 1)
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:quadrilaterals/xfd53e0255cd302f8:proofs-parallelograms/e/using-properties-basic-8th Exercise 8.1

(proof questions excluded)
Side and angle properties of a parallelogram (level 2)
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:quadrilaterals/xfd53e0255cd302f8:proofs-parallelograms/e/diagonal-properties-of-quadrilaterals-8th Exercise 8.1

(proof questions excluded)
Diagonal properties of parallelogram
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:quadrilaterals/xfd53e0255cd302f8:proofs-parallelograms/e/regular-polygons-advanced-8th Exercise 8.1

(proof questions excluded)
Unit test on Quadrilaterals
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:quadrilaterals/test/xfd53e0255cd302f8:quadrilaterals-unit-test?modal=1 Chapter Assessment

Areas of parallelograms and triangles (reduced)
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:areas-of-parallelograms-and-triangles#xfd53e0255cd302f8:areas-of-parallelograms-and-triangles

Area of parallelograms
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:areas-of-parallelograms-and-triangles/xfd53e0255cd302f8:area-of-a-parallelogram/e/area_of_parallelograms

Find missing length when given area of a parallelogram
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:areas-of-parallelograms-and-triangles/xfd53e0255cd302f8:area-of-a-parallelogram/e/find-missing-side-when-given-area-of-a-parallelogram

Find base and height on a triangle
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:areas-of-parallelograms-and-triangles/xfd53e0255cd302f8:area-of-a-triangle/e/find-base-and-height-on-a-triangle

Area of triangles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:areas-of-parallelograms-and-triangles/xfd53e0255cd302f8:area-of-a-triangle/e/area_of_triangles_1

Find missing length when given area of a triangle
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:areas-of-parallelograms-and-triangles/xfd53e0255cd302f8:area-of-a-triangle/e/find-length-when-given-area-of-a-triangle

Unit test on Areas of parallelograms and triangles (reduced)
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:areas-of-parallelograms-and-triangles/test/xfd53e0255cd302f8:areas-of-parallelograms-and-triangles-unit-test?modal=1 Chapter Assessment

Circles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:circles#xfd53e0255cd302f8:circles

Circle vocabulary
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:circles/xfd53e0255cd302f8:circles-and-its-related-terms/e/vocab-around-a-circle-6th Exercise 10.1

Inscribed angles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:circles/xfd53e0255cd302f8:angle-subtended-by-a-chord-arc-of-a-circle/e/inscribed_angles_1 Exercise 10.2

(proof questions excluded)
Inscribed shapes
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:circles/xfd53e0255cd302f8:inscribed-shapes-problem-solving/e/inscribed-angle-problem-solving Exercise 10.5

Unit test on Circles
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:circles/test/xfd53e0255cd302f8:circles-unit-test?modal=1 Chapter Assessment

Surface areas and volumes
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:surface-areas-and-volumes#xfd53e0255cd302f8:surface-areas-and-volumes

Finding area of triangle using Heron's formula
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:surface-areas-and-volumes/xfd53e0255cd302f8:herons-formula/e/finding-area-of-triangle-using-heron-s-formula Exercise 12.1

Volume of rectangular prisms
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:surface-areas-and-volumes/xfd53e0255cd302f8:cube-cuboid-and-cylinder/e/volume_1 Exercise 13.5

Volume of cylinders
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:surface-areas-and-volumes/xfd53e0255cd302f8:cube-cuboid-and-cylinder/e/volumes-of-cones--cylinders--and-spheres Exercise 13.6

Volume of cones
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:surface-areas-and-volumes/xfd53e0255cd302f8:cones-and-spheres/e/volume-of-cones Exercise 13.7

Volume of spheres
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:surface-areas-and-volumes/xfd53e0255cd302f8:cones-and-spheres/e/volume-of-spheres Exercise 13.8

Volume of cylinders, spheres, and cones word problems
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:surface-areas-and-volumes/xfd53e0255cd302f8:cones-and-spheres/e/volume-of-cylinders--spheres--and-cones-word-problems Word problems

Unit test on Surface areas and volumes
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:surface-areas-and-volumes/test/xfd53e0255cd302f8:surface-areas-and-volumes-unit-test?modal=1 Chapter Assessment

Statistics
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:statistics#xfd53e0255cd302f8:statistics

Read bar graphs (2-step problems)
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:statistics/xfd53e0255cd302f8:bar-graphs/e/reading_bar_charts_2 Exercise 14.3

Create bar graphs
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:statistics/xfd53e0255cd302f8:bar-graphs/e/creating_bar_charts_1 Exercise 14.3

Read histograms
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:statistics/xfd53e0255cd302f8:histograms/e/reading-histograms Exercise 14.3

Create histograms
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:statistics/xfd53e0255cd302f8:histograms/e/creating-histograms Exercise 14.3

Mean, median, and mode
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:statistics/xfd53e0255cd302f8:mean-median-mode-range/e/mean_median_and_mode Exercise 14.4

Range of ungrouped data
https://www.khanacademy.org/math/in-in-grade-9-ncert/xfd53e0255cd302f8:statistics/xfd53e0255cd302f8:mean-median-mode-range/e/range-of-ungrouped-data Exercise 14.4

Unit test on Statistics
https://www.khanacademy.org/math