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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.
Height Calculator The simplest height calculator (second one) draws on the fact that children inherit genes from both parents. It takes the average height of the parents and add 2.5 inches (6.5cm) for boys or subtract 2.5 inches for girls.