Do not use calculations for anything where loss of life, money, property, etc could result from inaccurate calculations.
The scale of inch is also used in the measurement of objects like doors, ceilings as well as other items that are shorter than a meter and are not practical to be measured with centimeters.
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Centimeters : The centimeter symbol cm is a unit of length in the metric system.
To convert 30 cm x 40 cm to inches, multiply 30 x 40 by 0.
Most popular convertion pairs of distance and length.