0.034127m
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well the circumference is 12 inches and Circumference = 2(pi)r.
Diameter = radius * 2 Circumference = pi * diameter.
Diameter = circumference/pi Radius = circumference/2*pi
If you know the circumference, the ration of the diameter to the circumference is π, so diameter = circumference/π If you have the radius, diameter = 2 x radius
circumference: Pi(3.14) x radius squared Diameter: radius squared radius: diameter divided by 2