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21/(2*pi) = a radius of about 3.342253805 units

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Q: What is the radius of a circle with a circumference of 21?
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What is the circumference of a circle with the radius of 21 inches?

A circle with a radius of 21 inches has a circumference of 131.95 inches.


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A circle with a radius of 21 meters has a circumference of 131.95 meters.


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