The pitch of the roof.
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The angle of inclination off horizontal is roughly 18-1/2o.
The slope is the rise/run.And then angle of incline = arctan(slope).
No
It is most often expressed as a ratio of inches of rise per 12 inches of run. A roof slope that rises 4 inches for every 12 inches of run is a "4 in 12" slope, or 4/12 slope, or 4:12 slope.
No slope is the angle at which a surface goes up or down.