• My Rum is Vodka!@lemmy.dbzer0.com
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    4 days ago

    Why do they use CM?

    Precision. “17dm” can be anything between 16.5dm or 17.5dm.

    You could of course say “I’m 17.5dm tall”, but at this point “I’m 175cm tall” is shorter (no dot).

    That said I’ve seen plenty people measuring height in metres and then centimetres. Usually something like “I’m one [metre] and 75 [centimetres] tall”.