Radius = 480/2pi which is about 76.394
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The formula for the circumference (C) of a circle is C = 2π r, where r is the radius. If 480 = 2π r, then r = 480/2π = 240/π = 76.394 inches (3dp)
The radius is 1/2 of the circumference.
If the circumference is 34.54, the radius is 5.497211734394065.
If the circumference is 20 the radius is 3.18
If the circumference of a circle is 351.68 the radius is: 56