The circumference of a 21 circle is: 65.97 (diameter x pi = circumference).
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The circumference of a circle that has a diameter of 21 is about 65.97
A circle with a radius of 21 inches has a circumference of 131.95 inches.
Circumference = 21*pi
The circumference of a 21-inch circle is: 66 inches.(C = d x Pi).
If you are talking about a circle then the circumference would be 65.97