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Angles of Elevation and Depression
Let O and P be two points such that the point P is at higher level. Let OA and PB be horizontal lines through O and P respectively.
If an observer is at O and the point P is the object under consideration, then the line OP is called the line of sight of the point P andthe angle AOP, between the line of sight and the horizontal line OA, is known as the angle of elevation of Point P as seen from O.
If an observer is at P and the object under consideration is at O, then the angle BPO is known as the angle of depression of O as seen from P.
Obviously, the angle of elevation of a point P as seen from a point O is equal to the angle of depression of O as seen from P.
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