History/origin: The milli- prefix is one of many metric prefixes. It ... 2 in, 50.8 mm. 3 in, 76.2 mm. 5 in, 127 mm. 10 in, 254 mm. 20 in, 508 mm. 50 in, 1270 mm.
There are 50.8 millimeters in 2 inches. An inch (in.) is part of the US customary system of measurement, whereas a millimeter (mm.) is part of the SI metric...
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