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
You would measure it in centimeters.
centimeters
I wouldn't use either, but centimeters are better than millimeters.
Use whatever is appropriate, or whichever you prefer. Centimeters are appropriate more often.
To convert centimeters to inches, you can use the ratio 1 inch = 2.54 centimeters. Divide the number of centimeters by 2.54 to get the equivalent length in inches. In this case, 101 centimeters would be equivalent to 101/2.54 = 39.76 inches.
How about: 4.5 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.
The customary ruler uses both inches and centimeters.
I would go with inches but you could measure it in centimeters.
If units are in centimeters cubed, you would use a ruler or a measuring tape to measure the length, width, and height of an object in centimeters. You can then multiply these three dimensions together to calculate the volume in cubic centimeters.
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Centimeters