In angle of depression, we studied that

1. Angle of depression.jpg

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

Angle of Depression from point A to point B is same as Angle of Elevation from point B to point A - Part 2

Now, the two horizontal lines are parallel,

and line of sight is the transversal

Angle of Depression from point A to point B is same as Angle of Elevation from point B to point A - Part 3

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 (Term 2)
  2. Concept wise

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.