What you can do for this case is to use the following trigonometric definition.
Tan (x) = a / b
Where,
a: opposite side of the triangle.
h: adjacent side of the triangle.
Clearing x:
x = Atan (a / b)
Substituting:
x = Atan (a / b)
x = Atan (5.74 / 4)
x = 55.12874356
Whole degree
x = 55
Answer:
x = 55 (option 3)
