Question

What is the exact area of a circle with a diameter of 18 feet using pi

Answer 1

A = 81 pi ft^2

Explanation:

The area of a circle is given by

A = pi r^2

r is d/2

r = 18/2

r =9

We need to leave pi as pi since we are asked for the exact answer

A = pi 9^2

A = 81 pi ft^2