Answer:
80 ft
Step-by-step explanation:
The area can be used to find the side length. The perimeter is the sum of side lengths.
A = s² . . . . . the area of a square is the square of its side length
s = √A . . . . the side length is the square root of the area
s = √(400 ft²) = 20 ft
The perimeter is the sum of the four equal-length sides of the square, so is ...
P = 4s
P = 4(20 ft) = 80 ft
Mrs. Drew needs 80 ft of wood to make the sides of the sandbox.
