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6 centimetres is a length: it does not have a diameter.
Since circumference equals pi times the diameter, if the diameter of a circle is 6, then its circumference is going to be pi times 6 or 6 pi.
If a circle has a circumference of 6 inches the diameter is: 1.91 inches (circumference divided by Pi = diameter).
The diameter is twice the radius so the answer is 12 millimeters.
The circumference of a 6 foot diameter circle is: 18.8 feet. (C = d x Pi)