Usually centimeters...the smaller ones are millimeters. To judge, there are 2.54 centimeters in an inch.
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The large lines indicate a kilometer per big line thingy
Usually just marks or lines. Depending which large lines you are talking about, they could be inches, centimeters, feet, decimeters, yards, or meters.
yes a metric ruler and a meter ruler is the same
The "tiny lines" that make up an inch on a ruler are centimeters.
None. A metric ruler would not show inches, as these are not a metric measurements. It would show millimetres and centimetres.