They don't. A lot of measurements of length only end in metre and with good reason. Examples of length that dont are the foot, the yard, mile.
The metre is adopted as the SI unit for length. If you see metre and it has a prefix, the prefix is telling you how many metres. i.e. kilo is 1000, decimeter is 1/10, centi is 1/100, milli is 1/1000 for example
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its unit. what your measuring it in. ex: inch, cm, meter
meter,feet and inch
A meter is longer than a decimeter. There are 10 decimeters in 1 meter.
The perimeter of 1 sq meter is 4 meters, which is 4 times the length of 1 meter. However, squared lengths (sq meter, sq foot) are not measurements of length, they are measurements of area. The shortest distance to cross 1 sq meter is the same as 1 meter, and the shortest distance to cover 1 sq meter is the length it takes to displace the perimeter.
measurements