A 45-foot circumference circle has an area of: 161.1 square feet.
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1145.9
198.944 ft2
127.324 ft2
The answer depends on what the 54 feet measures: the radius, diameter or circumference.
A 15-foot wide circle has an interior area of 176.71 square feet and a distance around the outside (circumference) of 47.1 feet.