Question

Find the exact circumference of a circle with an area equal to 36π sq. in.

1. 12π
2. 18π
3. 324π​

Answer 1

first option

Explanation:

Answer 2

C = 12 pi

Explanation:

The area of a circle is given by

A = pi r^2

36 pi = pi r^2

Divide each side by pi

36 = r^2

Take the square root of each side

sqrt(36) = sqrt (r^2)

6 =r

We can find the circumference

C = 2 * pi *r

C = 2* pi *6

C = 12 pi