Final answer:
The perimeter of a square with a side length of 18 feet is 72 feet.
Step-by-step explanation:
The perimeter of a square is the total length of all its sides. Since a square has four equal sides, we can find the perimeter by multiplying the length of one side by 4. In this case, the side length of the square is 18 feet, so the perimeter would be 18 x 4 = 72 feet.
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