The formula is pi x r2, so the answer would be 3.14 x 9 x 9 = 254 ft2.
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There are about 38.48 square feet in a 7' diameter circle
A 45-foot diameter circle has an area of 1,590.4 square feet.
The diameter is 4.222 feet.
An answers is impossible because there are no cubic units within a circle but only square units.
1256.64 square feet