You want the area of a circle, which is pi*r2
Just make sure your radius (r) is in feet and you answer will be square feet.
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A 16-foot circle has an area of 201.06 square feet.
The square foot area of a 41-foot diameter circle is: 1,320 square feet.
63.62 square feet.
Area of a circle = pi*radius squared
the square foot? are you sure this isn't a biology question?