circumference = 2*pi*6 = 37.699 inches to 3 decimal places
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75.36
Circumference = 2*pi*r = 12.566 cm (approx)
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The circumference is Pi x r x r.... In THIS case it's .25 x .25 x Pi... which equals 0.19634375
Circumference = 2*pi*r Circumference = 2*3.14*25 => 157 inches