We can relate the sides and the angle of right triangles with trigonometric ratios.
In this case, we can write:
[tex]\begin{gathered} \tan (x)=\frac{\text{Opposite}}{\text{Adyacent}}=\frac{8}{4}=2 \\ x=\arctan (2)\approx63\degree \end{gathered}[/tex]Answer: x = 63°
