### Home > CC2MN > Chapter 10 > Lesson 10.3.1 > Problem10-71

10-71.

Find the area and circumference of a circle with a radius of $7$ cm.

$\text{Area of a circle}=r^2\pi$
$\text{Circumference}=2\pi r$

Substitute $7$ for $r$ in each equation.

The area is approximately $153.9$ cm2. What is the perimeter?