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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.
New- Help in measuring a staircase. RISE. For a straight staircase measure your rise measurement first, this is the distance from the finished floor level where the staircase starts to the finished floor level on the upper floor where the staircase is going to.