Circumference of circle: 4 times pi in inches
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Given a circle with a diameter of 4, the circumference is: 12.6 (diameter x Pi = circumference).
12.5663706144, because the diameter (4) times Pi equals circumference
The circumference = Pai x Diameter = 3.14 x 4 = 12.56 cm
4*pi
Multiply the radius by 2 to get the diameter. Then multiply the diameter by pi to get the circumference. Example: If radius = 2 inches, diameter = 4 inches circumference = 4 x pi = 4 (3.1416) or about 12.57 inches