#### Answer

a$\approx$314

#### Work Step by Step

A = $\pi$$r^{2}$
$\pi$ is approximately 3.14, r is 10 mm
In this formula, r is the radius of the circle .What is the area if r is 10 mm and $\pi$ is 3.14?
A = $\pi$$r^{2}$
= 3.14 * $10^{2}$ (Apply exponent first)
= 3.14 * 100
$\approx$314 $mm^{2}$