That is how an inch was defined.
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12 inches = one foot
12 inches.
Nine inches is equal to 3/4 of one foot because one foot is equal to 12 inches.
There are 12 inches in one foot. Therefore, 84 inches is equal to 84/12 = 7 feet.
There are 12 inches in one foot. Therefore, 42 feet is equal to 42 x 12 = 504 inches.