Answer:
A. 53.1
Explanation:
I incorporated a drawing of the exercise. In any right triangle we can use three trigonometric functions in order to find the angles that are different to 90 degrees.
This trigonometric functions are :
Sine (sin)
Cosine (cos)
Tangent (tan)
The hint to solve this exercise is to use the inverse tangent. The tangent is define as
[tex]tan(\alpha)=\frac{opposite}{adjacent}[/tex]
In the drawing the opposite side length is 4 and the adjacent side length is 3
⇒
[tex]tan(\alpha)=\frac{4}{3}[/tex] ⇒
[tex]\alpha=tan^{-1}(\frac{4}{3})=53.13[/tex]
