A circle can be cut into smaller and smaller slices and rearranged in the shape of a parallelogram as shown.

Question

The formula for finding the area, A, of a parallelogram with base b and height h is shown.

Which equation represents the area of a circle in terms of its circumference?
A.

B.

C.

D.

Answer 1

B. A = (C^2) / 4π