Male:

The unit of length "meter" in the international system of units originated in France. 1790 In May, a special committee composed of French scientists suggested that one fortieth of the total length of the earth meridian passing through Paris should be used as the unit of length-meter, and 179 1 year was approved by the French Parliament.

Cm:

Is centimeter one? A unit of length measurement equal to one hundredth of a meter. The unit of length, abbreviated as cm. ， 1cm = 1/ 100m。

Decimeter:

A decimeter is a decimal unit of length. Ten centimeters equals one decimeter, and ten meters equals one meter.

Millimeter:

Millimeter, also called millimeter (or millimeter), right? Length unit and rainfall unit, abbreviated as mm in English. 10 mm is equivalent to 1 cm, 100 mm is equivalent to 1 decimeter, and 1000 mm is equivalent to 1 meter (which means milli).