Question

The circumference of a circle is 60 pi cm. What is the radius of the circle?

A) 90cm
B) 60cm
C) 120cm
D) 30cm

Answer 1

D

Explanation:

The formula for the circumference of a circle is 2
`\pi`r. So if we know that C=60
`\pi`then we can trace our steps back. We are given that pi remains constant so we are left with the 2r from the formula and a 60. 60/2 =30.

The radius is 30cm