A designer wants to make a circular fountain inside a square of grass as shown below. What is a rule for the area A of grass as a function of r?

Question

A circle is shown inscribed in a square. The circle has a radius of r, and the square has a side length of 2 r. The area outside the circle but also inside the square is shaded.
(1 point)
Responses

A = 2pi r^2

A = 3.75pi r^2

A = 2r^2 – pi r^2

A = 4r^2 –pi r^2

Answer 1

A = 4r^2 – pi r^2