Final answer:
The length of each side of the square is 3 feet.
Step-by-step explanation:
The area of a square is found by multiplying the length of one of its sides by itself.
In this case, the area of the square is 9 ft2. To find the length of each side, we need to take the square root of 9.
The square root of 9 is 3, so each side of the square is 3 feet long.