C = pi D = 10 pi = 31.416 centimeters (rounded)
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If a circle's diameter is 10, the circumference is: 31.416
The circumference of a 10-inch diameter circle is: 31.42 inches.
Circumference of circle: 10*pi = about 31.4 inches
Circumference = pi*10 meters
diameter = 10/pi inches