Circumference of a circle: 2*pi*radius or diameter*pi
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The answer depends on whether the 23 inch refers to its radius or diameter.
The circumference of a 6-inch circle is: 18.85 inches.
The circumference of a 42-inch diameter circle is: ~131.95 inches.
The circumference of a 10 inch circle is: 31.416 inches(circumference = diameter x pi).
The circumference of 9 inch diameter circle is about 28.27 inches.