Draw a triangle. The belt is the hypotenuse. There is a vertical leg that represents the change in height of the belt and a horizontal leg along the ground. If you are given the lengths of thr two legs, the angle of inclination is:
angle = arctan( vertical leg / horizontal leg )
If you’re given the belt length (hypotenuse) and vertical leg (change in height), it’s:
angle = arcsin( vertical leg / hypotenuse )
Use your calculator to compute the value of the arctan or arcsin.
