Question

The circumference of a circle is 18π ft. What is the area, in square feet? Express your answer in terms of \piπ.

HELp pls

Answer 1

A = 81 pi ft^2

Explanation:

We know the circumference of a circle is given by

C = 2 * pi *r

18 pi = 2 * pi *r

Divide each side by 2 pi

18 pi / ( 2pi) = 2 pi r / ( 2pi)

9 = r

We can find the area by

A = pi r^2

A = pi ( 9)^2

A = 81 pi ft^2