Answer:
13.1 feet
Explanation:
Area of a square = Length * Length
A = L²
Given the area of a square to be 172ft², to get the approximate length of each side of the square, we will substitute the area given into the formula above and calculate the value of L as shown;

take the square root of both sides;

Hence the approximate length of each side of the square to the nearest tenth is 13.1 feet