If that number represents the diameter, divide it by 2 to get the radius. Then use the standard formula for the area of a circle.
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A 16-foot circle has an area of 201.06 square feet.
63.62 square feet.
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.
Area of the circle in square feet: pi*radius squared