9514 1404 393
Answer:
72 feet
Explanation:
The diagonal of a square is √2 times the side length, so you have ...
diagonal = s·√2 = 18√2
Dividing by √2 gives ...
s = 18
The perimeter of a square is 4 times the side length, so is ...
P = 4s = 4(18) = 72
The perimeter is 72 feet.