**ANGLES OF ELEVATION AND DEPRESSION**

CONTENT

- Horizontal and Vertical Planes
- Angles of Elevation and Depression
- Measuring Angles of Elevation and Depression
- The Relationship between Angle of Elevation and Depression
- Scale Drawing

** **

**Horizontal and Vertical Planes**

An horizontal plane ** lies** (flat) in the same position as the ground while a vertical plane

**like a straight wall.**

*stands*** **

**Angles of Elevation and Depression**

**Angle of Elevation**

The angle that an observer would raise his or her line of sight above a horizontal line in order to see an object. The angle of elevation is the angle between the horizontal and the observer’s line of sight.

In the diagram above, the angle of elevation of the object from the observer is α^{0}.

**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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