The outside perimeter of the deck will be 30 feet
Since the area of the square given is 121 ft², each side of the square will be = ✓121 = 11 feet. In this case, the length of the square is 11 feet.
On the other hand, we've been given the information that the width of the deck to surround the pool will be 4 feet.
Therefore, the perimeter will be:
= 2(Length + Width)
= 2(11 feet + 4 feet)
= 2(15 feet)
= 2 × 15 feet
= 30 feet.
The outside perimeter of the deck is 30 feet.
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