A 36-inch diameter circle has an area of: 1,017.9 square inches.
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which is 7.07 square feet.
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A 20-inch diameter circle contains: 314.16 square inches.
A circle with a diameter of 300 inches has an area of 490.87 square feet.
2.77 square feet.
A 1.25-inch diameter circle contains 1.227 square inches.
A 4.75-inch diameter circle contains 17.72 square inches.