36
36 inches (4 sides x 9 = 36)
The perimeter of a square is four times the length of any of its sides. Thus, you can divide the perimeter by 4, and then square the result to get the area.
As a square has 4 even sides... and the total perimeter is 36 each side must be 9... so therefore the area is 9 (the same)
The perimeter of a square with 6 km sides is 24 km
The perimeter of a square with 2 inch sides is 8 inches.