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Basic distance is 1 metre, defined as one forty-millionth of the polar circumference of the Earth. Originally divided in accordance with Latin usage into tenths, hundredths and thousandths (decimetres, centimetres and millimetres). Multiples used Greek-derived prefixes for 10, 100 and 1000 metres (deka-, hecto- and kilo-). In recent times further divisions and multiples have come into use: nano, pica, mega, giga etc.

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15y ago

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