1 inch
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Multiply the radius by (2 x pi).
2 inches
A circle with a radius of 3 inches has a circumference of 18.8 inches
The radius of a circle with a 14.5 inch circumference is 2.15 inches
A circle's radius is always 1/2 of the circle's diameter, so the radius of a circle of 5-inch diameter is 2-1/2 inches.