131.95 inches, approx.
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A circle with a radius of 21 inches has a circumference of 131.95 inches.
The radius of a circle with a circumference 36 inches is: 5.73 inches.
A circle with a radius of 2.5 inches has a circumference of 15.71 inches.
The radius of a circle with a circumference of 272.2 inches is 43.3 inches.
A circle with a radius of 16 inches has a circumference of 100.53 inches.