Question

A(r) is a function that gives the area of a circle with radius r. It can be written in equation form as A(r) = 3.14r2. What is the value of A(3)?

Answer 1

Sub in 3 for r
A(3) = 3.14 * 3^2
A(3) = 3.14 * 9
A(3) = 28.26