Answer :
81 feet.
Since 36 is the perimeter, you divide it by 4 because it is a square, and all the sides of a square are congruent. 36 / 4 is 9. 9 is one of the sides of the square. To find the area, square the nine., and get 81 feet.
Since 36 is the perimeter, you divide it by 4 because it is a square, and all the sides of a square are congruent. 36 / 4 is 9. 9 is one of the sides of the square. To find the area, square the nine., and get 81 feet.