To convert length x width dimensions from inches to meters we should multiply each amount by the conversion factor. One inch equals 0.0254 meters, in order to convert 18 x 21 inches to meters we have to multiply each amount of inches by 0.0254 to obtain the length and width in meters. In this case to convert 18 x 21 inches into meters we should multiply the length which is 18 inches by 0.0254 and the width which is 21 inches by 0.0254. The result is the following:
18 x 21 inches = 0.457 x 0.533 meters
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.
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 inch value to the corresponding value in meters, just multiply the quantity in inches by 0.0254 (the conversion factor).
meters = inches * 0.0254
The factor 0.0254 is the result from the division 1 / 39.3701 (meter definition). Therefore, another way would be:
meters = inches / 39.3701
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