We use the formula for the area "A" of a square with equal sides of length "l":
Since we know the value of the area is:
We substitute that value into the formula for the area:
Next, we take the square root of both sides of the equation:
On the right side, the exponent and the square root will cancel, and we will get "l", and on the left side, we calculate the square root:
Which can be rounded to the closest value, that is 15 ft.
Answer: 15 feet