A circle with a radius of 10 inches has a circumference of 62.8 inches.
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Circumference of circle: 10*pi = about 31.4 inches
The circumference of a 10-inch diameter circle is: 31.42 inches.
Circumference = pi * diameter c = 10*pi inches c ~= 31.4 inches
Circumference = diameter x pi = 31.416 inches (rounded)
31.416 inches