If the circle is 20 ft radius, the area is π·20² = 1256.637 ft²
If the circle is 20 ft diameter, the area is π·(20/2)² = 314.1593 ft²
If the circle is 20 ft circumference, the are is π·(20/2π)² = 63.66198 ft²
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Area of a circle in square feet = pi*radius2
314.16 sq. ft.
The area of a circle is computed by the formula A = pi * r2 (r is the radius of the circle)For a 20 foot circle, the radius is 10 feet and the area is 314.16 square feet.
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.