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As given by the question
There are given that the triangle.
Now,
For finding the missing side, use the tangent and cosine function.
Hence, the tangent and cosine functions are to be used to find the sides.
Now,
For find the angle, use sine function:
[tex]\begin{gathered} \sin x=\frac{40}{42} \\ si\text{nx=}0.9 \\ x=\sin ^{-1}0.9 \end{gathered}[/tex]Then,
[tex]\begin{gathered} x=\sin ^{-1}0.95 \\ x=71.80 \end{gathered}[/tex]Hence, the angle of the given triangle is 71.8 degrees.