Which of the following options is correct if the sum of the circumferences of two smaller circles with radii r1 and r2 is equal to 4 times the circumference of a bigger circle of radius r?

Area topics are: Area of rectangles, squares, triangles, quadrilaterals, polygons, and circles.

Here are some area formulas for quantitative aptitude:
Rectangle: Area = (length x breadth)
Square: Area = (side)2 = (diagonal)2
Triangle: Area = x base x height
Parallelogram: Area = (base x height)
Circle: Area = R2, where R is the radius
Trapezoid: Area = 1⁄2 × (base + base) × height
Room walls: Area = 2 (length + breadth) x height
Circumference of a semi-circle: Circumference = R