31.416 inches
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The circumference of a 10-inch diameter circle is: 31.42 inches.
It is 10/pi = 3.1831, approx.
diameter = 10/pi inches
Circumference of circle: 10*pi = about 31.4 inches
A circle with a circumference of 10 inches has a radius of half the circumference divided by pi square rooted. r=(square root)[10/2]/pi r= 1.26156626101