in application problems, a horizontal line of sight is used as a reference line. an angle measured above the line of sight is called an angle of ____, and an angle measured below the line of sight is called an angle of depression.

elevation

In application problems, when a horizontal line of sight is used as a reference line, an angle measured above the line of sight is called an angle of elevation. Conversely, an angle measured below the line of sight is called an angle of depression.

To understand this concept and visualize it, consider standing on level ground and looking straight ahead. The line of sight is horizontal to the ground. If you gaze upward at an object above the horizontal line of sight, we refer to the angle between the line of sight and the object as the angle of elevation. On the contrary, if you look downward at an object below the horizontal line of sight, the angle between the line of sight and the object is known as the angle of depression.

These terms, "angle of elevation" and "angle of depression," are frequently used in various fields such as surveying, navigation, trigonometry, and physics. They help us describe and calculate heights, distances, and other measurements using geometric principles and trigonometric functions like sine, cosine, and tangent.