To convert length x width dimensions from centimeters to feet we should multiply each amount by the conversion factor. One centimeter equals 0.03281 feet, in order to convert 21 x 646 cm to feet we have to multiply each amount of centimeters by 0.03281 to obtain the length and width in feet. In this case to convert 21 x 646 cm into feet we should multiply the length which is 21 cm by 0.03281 and the width which is 646 cm by 0.03281. The result is the following:
21 x 646 cm = 0.69 x 21.19 feet
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.
A foot (symbol: ft) is a unit of length. It is equal to 0.3048 m, and used in the imperial system of units and United States customary units. The unit of foot derived from the human foot. It is subdivided into 12 inches.
To calculate a centimeter value to the corresponding value in feet, just multiply the quantity in centimeters by 0.03281 (the conversion factor).
feet = centimeters * 0.03281
The factor 0.03281 is the result from the division 1 / 30.48 (foot definition). Therefore, another way would be:
feet = centimeters / 30.48
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