The following is a list of definitions relating to conversions between square inches and square centimeters.
The centimeter practical unit of length for many everyday measurements.
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A centimetre is approximately the width of the fingernail of an adult person.
The inch is a popularly used customary unit of length in the United States, Canada, and the United Kingdom.
Another version of the inch is also believed to have been derived from the width of a human thumb, where the length was obtained from averaging the width of three thumbs: a small, a medium, and a large one.