Question

A circle has a radius of 6 cm. Find its exact circumference.

Answer 1

The radius of circle is r = 6 cm.

The formula for the circumference of circle is,

$C=2\pi r$

For exact circumference take pi = 3.14.

Substitute 6 for r in the formula to determine the circumference of circle.

$\begin{gathered} C=2\pi\cdot6 \\ =12\pi \\ =37.68 \end{gathered}$

So exact circumference of circle is 37.68 or 12 pi .