1 centimetre!
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A metric ruler is use to measure centimeter and millimeters.1 centimeter (cm) = 10 millimeters (mm) .
a centimeter is a linear (one) dimension - for example "this ruler is 10 cm long" a square centimeter is an area - a two dimensional term - for example if a floor tile is 10 cm long by 10 cm wide its area is 10 x 10 = 100 square centimeters.
On a standard ruler, 1.2 cm is slightly more than one centimeter but less than one and a quarter centimeters. It can be found just past the first centimeter mark, roughly one-fifth of the way toward the second centimeter mark. If you're using a metric ruler, it will be the second small line after the 1 cm mark.
100. An ordinary cm ruler is not likely to be long enough.
A small measures 15 cm .It is 15 cm long . It means 2 small ruler will be equal to 30 cm and 5 cm of 3rd ruler . It is 35 cm long .