You want to build a fence around a square garden that covers 506.25 ft2
How many feet of fence will you need to complete the job?
$$l^2=506.25$$
$${\mathtt{l}} = {\sqrt{{\mathtt{506.25}}}} \Rightarrow {\mathtt{l}} = {\mathtt{22.5}}$$
perimeter = fence = 4L = 4*22.5= 90feet
