Kilometer and centimeter
The metric unit of length is the 'meter'.
metre
The metric unit is the meter scaled to centimeters.
meter
Centimeters.
meter
The meter.
Millimeters
The basic unit of length in the metric system is the meter. Grams are used to measure weight and liter is used to measure liquid capacity.
centimeters
Centimetres.
Millimeters or centimeters.