cm typically refers to the unit of measurement, a Centimeter -- 100 Centimeters = 1 Meter, 1 Centimeter = .394 Inches
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210 (7x6x5)
0.2911 cm
You use a ruler or similar object that is marked with centimeters. If your ruler only has inches, measure the inches, then multiply with 2.54 to get centimeters.
Divide millimeters by 10: 56 millimeters is 5.6 centimeters.
a postage stamp.