There are no DIAmeters in 1 cm. Diameter is the measurement across a circle. You may mean decimeter or dekameter (also spelled decameter).
There are 0.1 decimeters in one centimeter. (a decimeter is 10 times bigger than a centimeter. That means 10 cm = 1 decimeter)
There are 0.001 decameters in one centimeter. (a decameter is 1000 times bigger than a centimeter. So 1000 cm = 1 decameter.)
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a diameter is not a unit of measurement; it is the distance across a circle.
To convert centimeters to inches, divide by 2.54.
Cylinder height in cm = volume/(pi*radius2)
Area= 4.90625 cm2
There is no specific unit of measurement as a diameter. Perhaps you are thinking of a decimetre, of which there are ten in one metre.