Circumference of a circle = 2*pi*radius or diameter*pi
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A circle with a radius of 6 inches has a circumference of 37.7 inches.
The radius of a circle with a circumference 36 inches is: 5.73 inches.
The circumference of a circle with a diameter of 45 inches is 141.37 inches.
A circle with a radius of 2.5 inches has a circumference of 15.71 inches.
A circle with a radius of 18 inches has a circumference of 113.097 inches.