Question

If the area of a circle is `25pi` `cm^2`, what is the circle's circumference?

Answer 1

Circumference = `10pi` cm.

Explanation:

Area of circle = `pir^2 = 25 pi cm^2`
`rArr r^2 = 25 cm^2`
`rArr r = 5 cm`

Circumference of circle = `pi2r = pi * 2* 5 cm = 10 pi cm`