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The angle of elevation of an object as seen by an observer is the
angle between the horizontal and the line from the object to the
observer's eye (the line of sight).
If the object is below the level of the observer, then the angle
between the horizontal and the observer's line of sight is called the angle
of depression.
Example 21
From the top of a vertical cliff 40 m high, the angle of depression of
an object that is level with the base of the cliff is 34º. How far
is the object from the base of the cliff?
Solution:
Let x m be the distance of the object from the base of the
cliff.
So, the object is 59.30 m from the base of the cliff.
Key Terms
angle of elevation, angle
of depression
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