Question

The area of a circle is 25in^2. What is the circumference, in inches? Express your

Answer 1

Answer:

$c = 10 \sqrt{\pi}$

Step-by-step explanation:

A = pi*r^2

We first plug in 25 for A

25 = pi * r^2

Solve

$r = \sqrt{ \frac{25}{\pi} }$

We can then plug in r for circumference formula

C = 2pi * r

$c = 2\pi \sqrt{ \frac{25}{\pi} }$

$c = 10 \sqrt{\pi}$

or 17.72