divide it by 3.141592653 then divide it by 2
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The radius of a circle, if its circumference is 420 feet, is 66.8 feet.
The circumference of a circle that has a radius of 12 feet is about 75.4 feet.
A circle with a radius of 14 feet has a circumference of 87.96 feet.
The circumference of a circle when the radius is 25 feet equals about 157.08 feet.
The circumference is 12.57 feet. (radius x 2 x pi = circumference)