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A ruler
One side of the ruler has centimeters and the other side has inches. Centimeters are smaller than inches. The side with more units is the metric side.
Centimetres, with millimetres marked but not labelled.
metric ruler is used for measuring the length of the objects in mm and cm. hence ,1cm=10 mm.In metric ruler =15 cm.
The main unit in the metric system is the meter. It measures length.
Probably centimetres.
A metric ruler measure a legth not a volume.
How do you change metric units?
base on what you measure to use the metric units.
A ruler
To measure the mm of an item you would need to use a metric ruler. The metric ruler has cm and mm on it.