What is the perimeter of a square with an area of 900 square feet

120 ft.

Step-by-step explanation:

The area of a square is a². The area of this square is 900 ft², so you need to square root it to get the length of one side. √900 is 30, so each side of the square is 30 ft since all sides of a square all equal. To find the perimeter multiply 30×4 to get 120 ft. Hope this helps :)