Using the formula for m=slope=ystep/xstep the slope of your staircase is 8/12= 2/3 and hence 66.6% slope
14.4 inches ( to 1 decimal place)
the rise and tread are at right angles to each other and the slope is the hypotenuse of the right triangle formed
using Pythagoras' identity
slope = √(8² + 12²) = √(64 + 144) = √208 = 14.4 ( to 1 dec. place)
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