r = 6 inches
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Circumference of the circle if the radius is 12 inches is 2*pi*r = 24*pi = 75.398
diameter = 2 X radius = 12 inches
A circle with a radius of 6 inches has a circumference of 37.7 inches.
Radius = 1/2 of the diameter = 6 inches
Approximately 75.4 inches.