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3.976 sq. ft. solved thusly: area of a circle is pi times radius squared. Radius is half of diameter so: 1/2 of 27 inches is 13.5 inches. 13.5 squared =182.25 square inches 182.25 times pi (3.1416) = 572.5553 divide by 144 to change from square inches to square feet = 3.976078

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Q: How many square feet is 27 inch diameter?
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