A circle with a radius of 6 inches has a circumference of 37.7 inches.
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Circumference = 37.7 inches Diameter = 12 inches
Its circumference is: 75.4 inches.
Circumference of the circle if the radius is 12 inches is 2*pi*r = 24*pi = 75.398
Approximately 75.4 inches.
circumference = 12*pi = 37.699 inches to 3 decimal places