The circumference is 21.269 feet.
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A 45-foot circumference circle has an area of: 161.1 square feet.
To find the area of a circle, either the diameter or the circumference must be known. The formula for the area from the diameter is (pi)*(1/2 of diameter) squared. From the circumference, simply substitute (circumference / pi) for diameter.
The square foot area of a 41-foot diameter circle is: 1,320 square feet.
Area = pi * r2 Circumference = 2 * pi * r Pi = 3.141592 r = square root of Area/pi Cir then = 2 * pi * (square root of Area/pi)
A 16-foot circle has an area of 201.06 square feet.