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There are many ways to find the angle of a slope.
One easy practical way to see if a slope is 10 degrees is to have a 1 metre long (1000 mm) straight edge and put one end on the slope surface while holding it horizontal with a spirit level. The "free" end will be 176 mm (176.327 mm) off the surface if the slope is 10 degrees.
(Tan 100 = 176 / 1000 to nearest round figures).
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