45 inches is an old unit of length called an "ell"
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To convert linear inches to feet, you need to divide by 12 since there are 12 inches in a foot. Therefore, 45 linear inches is equal to 3.75 feet (45 inches / 12 inches per foot = 3.75 feet).
Linear inches is a term used by the airline industry in order to measure baggage allowances. The linear inch measurement is determined by adding the length, width, and height of the item in inches. For instance a 20" square box that is 5" tall would be 20 + 20 + 5 arriving at a total of 45 linear inches.
10 x 4 -45 square inches 10 in inches square
500 inches is bigger than 45 feet
Using Pythagoras' theorem the other leg is 45 inches So: 51+24+45 = 120 Perimeter = 120 inches