12 inches times pi (3.14) = 37.68 inches or 37 11/16"
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The circumference of a circle whose radius is 6 inches is: 37.7 inches.
A circle with a radius of 6 inches has a circumference of 37.7 inches.
Diameter = 6 inches Radius = 3 inches Circumference = 2 x pi x radius = 18.84955592 inches
Circumference of a circle: 2*pi*radius or pi*diameter
Circumference: 2*pi*3 = 6*pi inches