To find the angle Q we can us the sin law so:
[tex]\frac{\sin (Q)}{48}=\frac{\sin (90)}{73}[/tex]So we can solve for Q so:
[tex]\begin{gathered} \sin (Q)=\frac{48}{73} \\ \measuredangle Q=\sin ^{-1}(0.6) \\ \measuredangle Q=36.87 \end{gathered}[/tex]