# How do you find the circumference of a circle with diameter 7.2cm?

Sep 11, 2015

$7.2 \pi$ cm

#### Explanation:

The formula for the circumference of a circle is:

$C i r c u m f e r e n c e = 2 \times \pi \times R a \mathrm{di} u s$
or
$C i r c u m f e r e n c e = \pi \times D i a m e t e r$

You're given the diameter, so we can use the second formula.
$C i r c u m f e r e n c e = 7.2 \pi$ cm

Your class might use different approximations for $\pi$, such as $3.14$ or $\frac{22}{7}$. Make sure to use them if you have to.