Respuesta :

From the figure:

[tex]\begin{gathered} m\angle PSR=\frac{PR}{2} \\ so\colon \\ 18=\frac{PR}{2} \\ PR=2\cdot18 \\ PR=36 \end{gathered}[/tex]

therefore:

[tex]\begin{gathered} m\angle PQR=PR \\ m\angle PQR=36 \end{gathered}[/tex]