Question

Mark wants to replace a circular patio.The diameter of the patio is 40 feet.What is the area that he needs to cover? Choose from one of these answers:1100,1256,1349,1500

Answer 1

The formula for the area of a circle is:
\[A=\pi r^{2}\]
r=diam/2 so
\[A=\pi (20)^{2}\]
\[=pi(400)\]