To convert length x width dimensions from feet to inches we should multiply each amount by the conversion factor. One foot equals 12 inches, in order to convert 21 x 5 feet to inches we have to multiply each amount of feet by 12 to obtain the length and width in inches. In this case to convert 21 x 5 feet into inches we should multiply the length which is 21 feet by 12 and the width which is 5 feet by 12. The result is the following:
21 x 5 feet = 252 x 60 inches
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.
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 foot value to the corresponding value in inches, just multiply the quantity in feet by 12 (the conversion factor).
inches = feet * 12
The factor 12 is the result from the division 1 / 0.0833333 (inch definition). Therefore, another way would be:
inches = feet / 0.0833333
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