In angle of depression, we studied that

1. Angle of depression.jpg

Here, the angle of elevation of the girl to the boy is

2. Angle of depression Angle of elevation.jpg

Now, the two horizontal lines are parallel,

and line of sight is the transversal

3. Angle of depression Angle of elevation.jpg

AB and CD are parallel lines,

and BC is the transversal

∴ Angle of depression and angle of elevation are alternate angles, and they are equal

∴ Angle of depression = Angle of elevation

Thus, Angle of Depression from point A to point B is same as Angle of Elevation from point B to point A

  1. Chapter 9 Class 10 Some Applications of Trigonometry
  2. Concept wise
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