One centimeter equals 0.01 meters, to convert 21 centimeters to meters we have to multiply the amount of centimeters by 0.01 to obtain the width, height or length in meters. 21 centimeters are equal to 21 x 0.01 = 0.21 meters.
The centimeter (symbol: cm) is a unit of length in the metric system. It is also the base unit in the centimeter-gram-second system of units. The centimeter practical unit of length for many everyday measurements. A centimeter is equal to 0.01 (or 1E-2) meter.
The meter (symbol: m) is the fundamental unit of length in the International System of Units (SI). It is defined as "the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second." In 1799, France start using the metric system, and that is the first country using the metric.
To calculate a centimeter value to the corresponding value in meters, just multiply the quantity in centimeters by 0.01 (the conversion factor).
meters = centimeters * 0.01
The factor 0.01 is the result from the division 1 / 100 (meter definition). Therefore, another way would be:
meters = centimeters / 100
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