The radius of a circle if its circumference is 42 is about 6.68
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A circle with a radius of 42 feet has a circumference of 263.89 feet.
Circumference = 42 inches => radius = 42/(2*pi) = 6.68 inches (approx)
If a circle circumference is 30 the radius is: 4.77
The radius of a circle with a circumference of 59 is: 9.39
The circumference of a circle with a 2pi radius is: 39.58