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Well, the equation for finding the circumfrence of a circle is (diameter)(pi). That is diameter times pi. since the diameter of a circle is 2 radii, we can say that there is 2(pi) radii in a circle.
22 ft. The diameter is the measurement of a circle through the center from side to side and is equal to two times the radius.
Caliber is a term used to describe the diameter of a bullet in SAE units. 100 Caliber = 1 inch a 45 caliber bullet has a diameter of .45 inches.