multiply the radius (r) by 2 to get the diameter (d). so if r=6 then 2*6=12 d=12.
then multiply by pi. pi=3.14. so 12 * 3.14 is 37.68 the circuference is 37.68
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circumference = 2*pi*6 = 37.699 inches to 3 decimal places
12.56
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75.36
Circumference = 2*pi*r = 12.566 cm (approx)