Page 1 - Lesson Notes-Introduction Ch-9 (Applications of Trigonometry)
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SAI International School
Class X
Mathematics – Lesson Notes
Chapter-9: Applications of Trigonometry
Sub Topics – Introduction
Line of sight, angles of elevation and depression
Important terms-
1. Line of sight- The line of sight is the line drawn from the eye of an observer
to the point in the object viewed by the observer
2. Angle of Elevation- 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).
3. Angle of depression- 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.
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