To convert length x width dimensions from centimeters to inches we should multiply each amount by the conversion factor. One centimeter equals 0.393701 inches, in order to convert 18 cm x 21 cm to inches we have to multiply each amount of centimeters by 0.393701 to obtain the length and width in inches. In this case to convert 18 cm by 21 cm into inches we should multiply the length which is 18 cm by 0.393701 and the width which is 21 cm by 0.393701. The result is the following:
18 x 21 cm = 7.09 x 8.27 inches
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.
An inch (symbol: in) is a unit of length. It is defined as 1⁄12 of a foot, also is 1⁄36 of a yard. Though traditional standards for the exact length of an inch have varied, it is equal to exactly 25.4 mm. The inch is a popularly used customary unit of length in the United States, Canada, and the United Kingdom.
To calculate a centimeter value to the corresponding value in inches, just multiply the quantity in centimeters by 0.393701 (the conversion factor).
inches = centimeters * 0.393701
The factor 0.393701 is the result from the division 1 / 2.54 (inch definition). Therefore, another way would be:
inches = centimeters / 2.54
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