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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.
Designing Outdoor Stairs. The first measurement you must take is the total rise. Divide that total by seven to determine the best height for each riser, and round to the nearest whole number. Divide the total rise by that number and round the dividend up to reach the final rise per stair.