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The circumference of a circle if its radius is 13cm is: 81.68 cm
75.36
Circumference = 2*pi*r = 12.566 cm (approx)
circumference = 2*pi*6 = 37.699 inches to 3 decimal places
The circumference is Pi x r x r.... In THIS case it's .25 x .25 x Pi... which equals 0.19634375