Question

A circle has a circumference of 81.64cm. What is its Radius?

Answer 1

`circumference = 2 * \pi * radius`


`\pi = 3.14`


`Substitute \ 3.14 \ for \ \pi`


`81.64 cm = 2 * 3.14 * radius`


`81.64cm / (2 * 3.14) = radius`


`81.64cm / 6.28 = radius`


`13 cm = radius`