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 9 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 9 cm by 21 cm into inches we should multiply the length which is 9 cm by 0.393701 and the width which is 21 cm by 0.393701. The result is the following:
9 x 21 cm = 3.54 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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