Conversion of inches (in)

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An inch is a unit of distance equal to one twelfth of a foot, or 2.54 centimeters. It is part of the imperial system of measurement and is commonly used in the United States and United Kingdom. The inch has been used in various forms in different cultures throughout
history, with the ancient Egyptians, Babylonians, and Romans all having their own versions of the inch.

Is there any equivalence between Ancient Roman units and the metric system?

Which were the first countries to use the metric system?

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