The area of a square can be found by using the following expression:
where "A" is the area and "l" is the length of each side of the square. The square on this problem has an area of 9 cm², so we can find the sides by replacing A for 9 on the expression above.
To solve it we need to take the square root on both sides of the equation.
Each side of the square has a length of 3 cm, so the sides are 3 cm x 3 cm.