Question

The circumference of a circle is 30 pi. what is the radius of the circle

Answer 1

Formula to find circumference is ;
$2\pi \: radius$
Since the given circumference is 30 pi then,

30 pi = 2 pi radius.
30 = 2 radius
radius = 30/2
radius = 15

The radius is 15 for a circle tha has circumference of 30 pi