Answer:
13.6°
Explanation:
You want to know the angle of depression that results in a 1267 ft drop for a zip line of length 5400 ft.
Sine
The sine relation tells you ...
Sin = Opposite/Hypotenuse
Application
In this problem, the geometry is that of a right triangle with hypotenuse 5400 feet and the angle of interest opposite a side of length 1267 ft. That means ...
sin(α) = 1267/5400
α = arcsin(1267/5400) ≈ 13.6°
The angle of depression is about 13.6°.