Angle of Elevation - It is the angle from the horizontal to the line of sight of the observer to the object ABOVE, Angle of Depression - It is the angle from the horizontal to the line of sight of the observer to the object BELOW, Line of sight - It is an imaginary line that connects the eye of an observer to the object being observed., Horizontal Line of Sight - The imaginary line assumed for the horizontal eye level of the observer,

Definition

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