Use this formula: radius x 2 x Pi (3.1416) = circumference
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Seven inches.
A circle with a radius of 8 inches has a circumference of 50.27 inches.
The radius of a circle with a circumference 36 inches is: 5.73 inches.
A circle with a radius of 16 inches has a circumference of 100.53 inches.
A circle with a radius of 2.5 inches has a circumference of 15.71 inches.