Question

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

Answer 1

A = π r^2
A = 9^2 π
A = 81π 

if using π = 3.14 then

A = 3.14 x 81 = 254.47 ft^2

answer: 81π ft^2 or 254.47 ft^2

hope that helps