What is the area of a square with a perimeter of 80 feet?

If the perimeter of a square is 80' then each side must be 20' in length. (4 x 20 = 80)

The area of a rectangle is obtained by multiplying the length by the width.

A square is a rectangle with all four sides of equal length therefore the area is two lengths multiplied together.

20 x 20 = 400 sq ft is thus the area of the square.