Circumference of a circle: 2*pi*radius or diameter*pi
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Your question is a tautology.
The circumference of a 3.5 inch circle is: 10.996 inches.
The radius of a circle with a 14.5 inch circumference is 2.15 inches
The circumference of a 27-inch circle is: 84.8 inches.
The circumference of a 21-inch circle is: 66 inches.(C = d x Pi).