# What is the circumference of a circle with radius of 30 inches?

May 29, 2018

$\textcolor{b l u e}{188.5 \text{ inches}}$

#### Explanation:

The circumference of a circle is given by:

$2 \pi r$

Where $\boldsymbol{r}$ is the radius, and $\boldsymbol{\pi}$ is the ratio of the circumference of a circle to its diameter.

We have radius $= 30$

$\therefore$

$2 \left(30\right) \pi = 60 \pi$

If $\pi \approx 3.1416$

$2 \left(30\right) \left(3.1416\right) = 188.5$inches. 2 d.p.