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Summary

  • The angle of elevation = The angle of depression.


     

  • The observer (If his height if not mentioned) is considered as a point.
  • The problem is translated into the diagram having triangle(s).
  • The problem is solved using trigonometric values.
  • The line of vision is raised by an angle of measure from the horizontal level. This θ is known as the measure of angle of elevation.
  • The line of vision is lowered down by an angle measure θ from the horizontal level. This  θ is known as the measure of angle of depression. 




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