Question

Given a circle with an area of 25 pi in^2
What is the exact circumference?

Answer 1

31.4

Explanation:

C = 2πr OR C = πd

But, we need to find r first.

`A = \pi r^2\\25\pi = \pi r^2\\√(25) = √(r^2) \\r=5\\\\C=2\pi r\\C=2\pi (5)\\C= 10\pi \\C= 31.4`