Circumference of 9 inches: 2.864788975654119in. (for pi I used 3.14159265358979)
Diameter of 9 inches:
4.5in.
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The radius of a circle with a 14.5 inch circumference is 2.15 inches
1 inch
The radius of a circle is half the diameter, so the radius of a 6 inch diameter circle is 3 in.
radius of 31 inches
(pie)(diameter)=(circumference) (pie)(9)(2)=18(pie)=56.549