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# ANGLES OF ELEVATION AND DEPRESSION

CONTENT

1. Horizontal and Vertical Planes
2. Angles of Elevation and Depression
3. Measuring Angles of Elevation and Depression
4. The Relationship between Angle of Elevation and Depression
5. Scale Drawing

## Horizontal and Vertical Planes

An horizontal plane lies (flat) in the same position as the ground while a vertical plane stands like a straight wall.

## 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 α0.

### 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.

Lesson tags: JSS2 Mathematics, JSS2 Mathematics Evaluation Questions, JSS2 Mathematics Evaluation Questions Third Term, JSS2 Mathematics Objective Questions, JSS2 Mathematics Objective Questions Third Term, JSS2 Mathematics Third Term, Mathematics Lesson Notes, Mathematics Objective Questions
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