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Provided the run is not zero, rise/run gives the gradient, or slope, between two points.
figuring slope
You can use the formula x2 - y2 over x1 - y1 or you can use the formula: Rise over Run. If you use rise over run formula, you HAVE to make sure that you form a right triangle.
You can use math in running by calculating how many miles or yards you have run.
You use the two scale's,leg's, of the square to layout the rise and run of your stair's. Rise = the height of each step example 7.5". Run = the length of each step example 12".