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Length, when referring to measurement in one dimension (as in the length of a line segment or a or a piece of string), has a specialized meaning. So does height when it is used in conjunction with base.
Steps. 1  1. Measure the length, width and height of a single unit in either inches or meters. Whichever unit of measurement you use, measure all dimensions in the same unit of measurement. 2  2. Multiply the length, width and height of the unit together. 3  3. Divide the result by 1728 if your measurements were in inches.