In the case of a road, the rise is the change in altitude, while the run is the difference in distance between two fixed points, as long as the distance for the measurement is not large enough that the earth's curvature should be
This calculator calculates the roof pitch, slope, angle using rise (s), run (n) values. Formula: Pitch = S / ( N / 12 ) Slope = ( S / N ) × 100 Angle = tan -1 ( S / N ) Where, S = Rise
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The steps help with figuring out how to do the problems, I eventually was able to get through most of my problems with out it, but it is a good way to check all of your work.