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Inner circumference = 14*pi mm
The circumference of an eclipse, is an even when the moon covers almost all of the sun and the only thing that is visible is a ring. When entering and leaving the eclipse, there is also a bright spot at one end. This event is called a solitaire ring because of its appearance.
i believe you mean US sizes Diam = 20.7 mm Circum = 64.1 mm
Using the formula C=Pi x D Therefor the diameter of a shot putt ring is 12 feet and Pi = 3.14 So 3.14 x 12 = 37.68 feet
Circumference = 2pi*r Circumference = 86pi