Diameter = 2 * radius
So in this case, 40 feet.
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40'
20; the diameter of a circle is twice its radius.
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.
Double the value of the radius which in this case is 2*20 = 40 feet
Circumference of a circle = 2*pi*radius or pi*diameter Area of a circle = pi*radius squared