A centimetre is a measurement unit. It can have no diameter.
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It depends on what the 6 cm refer to! The diameter of a shape with a 6 cm diameter is ... surprise!... 6 cm.
Diameter in cm = circumference/pi
it is half the diameter e.g 10cm diameter = 5 cm radius
66.21 cm
The length of the diameter will be 30 cm if the radius is 15 cm.