What is the area of a square with a 80 ft. perimeter

400 sq. ft.

Step-by-step explanation:

We gotta find the length of a side:

First, we divide 80 by 4, because the perimeter of a square is (4 x side):

80 ft. / 4 = 20  ft.

Second, we doing the normal area of a square equation:

= 400 square ft.

Which leads to out answer of 400 sq. ft.