pi times the square of 8.5 = almost exactly 227 sqft
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A circle with a diameter of 18 feet has an area of 254.5 square feet.
A circle with a diameter of 24 feet has an area of 452 square feet.
153.93804 square feet.
A circle with a diameter of 300 inches has an area of 490.87 square feet.
A 20-inch diameter circle contains: 314.16 square inches.