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Key Concepts
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1. Line of Sight
The line drawn from the eye of an observer to the object viewed by the observer.
2. Angle of Elevation
The angle formed by the line of sight with the horizontal when the object is above the horizontal level.
3. Angle of Depression
The angle formed by the line of sight with the horizontal when the object is below the horizontal level.
Note: The Angle of Elevation is always equal to the Angle of Depression if the two points are horizontal to each other (Alternate interior angles).