Centimeters are part of the SI unit, or international system of units. Scientists all over the world use this system of measurement, and is the only system of measurement that every scientist in the world uses.
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centimeters
Use whatever is appropriate, or whichever you prefer. Centimeters are appropriate more often.
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.
I would go with inches but you could measure it in centimeters.
Centimeters