32 In This Section We Defined The Angle Of Inclination Also Known As The Angle Of Elevation And In This Exercise We 1 (24.36 KiB) Viewed 15 times
32 In This Section We Defined The Angle Of Inclination Also Known As The Angle Of Elevation And In This Exercise We 2 (45.03 KiB) Viewed 15 times
32. In this section, we defined the angle of inclination (also known as the angle of elevation) and in this exercise we introduce a related angle - the angle of depression (also known as the angle of declination). The angle of depression of an object refers to the angle whose initial side is a horizontal line above the object and whose terminal side is the line-of-sight to the object below the horizontal. This is represented schematically below.
horizontal Observer Object The angle of depression from the horizontal to the object is 0. (a) Show that if the horizontal is above and parallel to level ground then the angle of depression (from observer to object) and the angle of inclination (from object to observer) will be congruent because they are alternate interior angles. (b) From a fire tower 200 feet above level ground in the Sasquatch National Forest, a ranger spots a fire off in the distance. The angle of depression to the fire is 2.5º. How far away from the base of the tower is the fire?
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