In order to find the missing angle B, we can use its sine relation.
The sine relation is the length of the opposite side to the angle over the length of the hypotenuse.
So we have:
[tex]\begin{gathered} \sin (B)=\frac{b}{c} \\ \sin (B)=\frac{5}{43} \\ B=\arcsin (\frac{5}{43}) \\ B=6.68\degree \end{gathered}[/tex]
So the angle B is 6.68°.
