Question

What is the circumference of a circle whose area of 121 pi square meters?

Answer 1

Answer: about 69

Explanation:

you have to work in reverse

Area=(pi)r^2

because this equalled 121, the radius has to be 11.

SO, we can use the radius to find the circumference

Circumference = 2(pi)r

Circumference = 22pi which is 69.08

Answer 2

C=22pi or 69.115...

Explanation:

A=pi r^2

solve r=11

C=2pi r

C=22pi