CPM Homework Help : MC2 Problem 9-78

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

Hint:

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

More Help:

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

Partial Answer:

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