(2 x 20 x 3.1415)/(5/360) = 20.94 inches
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The circumference of circle with 2 foot radius is: about 12.57 feet. (c = r x 2 x Pi)
The radius of a circle is half the length of the diameter. Therefore, if the diameter is 1 foot, the radius would be 0.5 feet. This is because the radius is the distance from the center of the circle to any point on the circle's circumference, while the diameter is the distance across the circle passing through the center.
If the diameter is 5 feet then the radius is 2.5 feet. If the circumference is 5 feet then the radius is 0.79577 feet.
An 8-foot diameter circle has a circumference of about 25.132 inches.
The circumference is 188 feet.