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Middle School Math Formulas
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Middle School Math Formulas
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25 Questions

1.
volume = 2D base x 3D height. i.e. V = (πr^2)H

2.
A = pi times radius squared

3.
Rise / Run: Change in Y / Change - ∆y / ∆x - y1-y2 / x1-x2

4.
IA=central angle(or intercepted arc)/2

5. Distance = Rate x Time (remember that you can manipulate this formula)

6.
Y=mX+b where m = slope, b = y-intercept.

7.
In right triangles, a^2 + b^2 = c^2, where c is always the hypotenuse

8. sum = (n-2)*180, where n = number of sides

9.
2πrh+2πr². TIP: Think about a can of soup - you need both bases (circles), and the label that wraps around (a rectangle with h = height of can and b = circumference of base)

10.
1/3 volume of cylinder with same base: i.e. V = 1/3 (πr^2 * H)

11.
an = a1 + (n - 1)d

12.
A = base x height

13.
A = (base x height) / 2

14. y-y1 = m(x-x1) where (x1, y1) is a point on the line and m = slope

15.
D = 2 x radius

16.
C=π2r or diameter x pi, where diameter = 2 times the radius

17.
S = π r l + π r², where l = slant height of the cone

18.
√(x1-x2)^2 + (y1-y2)^2). TIP: draw the right triangle & use pythagorean theorem.

19.
4πr²

20.
Sine = opposite / hypotenuse. Remember SOH

21.
measure = ((n-2)*180)/n, where n = number of sides. Remember that regular polygon = all sides congruent, all angles congruent (ex. Equilateral Triangle)

22.
an=a1(r)^n-1

23.
i = √-1

24.
In Ax^2+Bx+C=0, x = (-b+/-√(b^2-4ac))/2a. TIP: Try factoring first.

25.
Cosine = adjacent/hypotenuse. Remember CAH.

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