The circumference of a 10-inch diameter circle is: 31.42 inches.
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If a circle's diameter is 10, the circumference is: 31.416
A circle with a radius of 10 inches has a circumference of 62.8 inches.
Circumference of circle: 10*pi = about 31.4 inches
Circumference = pi*10 meters
The circumference of a 10 cm circle is 31.42 cm (C = d x Pi).