The formula is pi*r^2, 30/2 is 15ft. 15x15x3.14159 is 706.86 sq ft
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The square foot area of a 41-foot diameter circle is: 1,320 square feet.
A 45-foot diameter circle has an area of 1,590.4 square feet.
The area of a circle with a 7-foot diameter is: 38.48 square feet.
3.14159265 square feet.
132.7 square feet.