Respuesta :

[tex]\begin{gathered} m\angle R=130 \\ so\colon \\ m\angle P=130 \end{gathered}[/tex][tex]\begin{gathered} m\angle SPT=180-m\angle P \\ \text{Because they are supplementary} \\ m\angle SPT=180-130=50 \end{gathered}[/tex][tex]\begin{gathered} m\angle PTS=m\angle SPT \\ \text{Because:} \\ ST\cong SP \\ \text{Therefore:} \\ m\angle PST=180-m\angle PTS-m\angle SPT \\ m\angle PST=180-50-50 \\ m\angle PST=80 \end{gathered}[/tex]

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