A circle of radius r has a circumference of 2*Pi*r and an area of Pi*r*r, where Pi is the constant which is approximately 3.14159. Use the first equation to calculate the radius and then the second to calculate the area.
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The square foot area of a 41-foot diameter circle is: 1,320 square feet.
A 16-foot circle has an area of 201.06 square feet.
The area of a 17-foot circle is: 227 square feet.
The area of a 10 foot circle is: 78.54 square units.
Area of a circle = pi*radius squared