Answer:
55.5°
Explanation:
You want the angle in a right triangle that has opposite side 16 and adjacent side 11.
Tangent
The tangent relation is ...
Tan = Opposite/Adjacent
In this geometry, that means ...
tan(x) = 16/11
Taking the inverse tangent, we have ...
x = arctan(16/11) ≈ 55.49° ≈ 55.5°
The angle x is about 55.5°.