What does the angle of depression represent?

The angle of depression is defined as the angle formed by a line of sight downwards from a horizontal level. This occurs when an observer looks down at an object that is positioned lower than their eye level. In practical terms, if you were standing on a hill and looking at something on the ground below, the angle between your line of sight to the object and a horizontal line extending from your eyes is the angle of depression.

Understanding this concept is essential in various real-life applications, such as navigation, architecture, and construction, where elevation and sightlines are crucial for planning and execution. The other options do not accurately describe the angle of depression: looking above the horizontal pertains to the angle of elevation, while the angle between a horizontal line and a vertical line represents a right angle rather than a specific angle of depression. Additionally, the angle of an upward slope describes inclination rather than a downward perspective.