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Inch and centimeter are both linear units of measurement. They are used to measure small distance. The conversion is done by multiplying the inch measurement by 2.54. The above unit in centimeters equals 2.1 cm (Approximately).
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∙ 9y agoThis answer is:
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Wiki User
∙ 14y ago21 mm equals 2.1 cm
the conversion between "mm" and "cm" is that 10mm=1cm
so 21mm equals 2.1cm
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