Chapter 8 - Right Triangles and Trigonometry - 8-4 Angles of Elevation and Depression - Practice and Problem-Solving Exercises - Page 519: 15

$\angle 7$ is at an angle of depression from the horizontal line of the waterfall to the level of Max's eye.

$\angle 7$ is at an angle of depression from the horizontal line of the waterfall to the level of Max's eye. The angle is at a decline from the waterfall to Max.