[tex]\begin{gathered} \angle1\cong\angle8\colon\text{ Alternate exterior angles} \\ \angle3\cong\angle7\colon\text{ Corresponding angles} \\ \angle4_{}suplementary_{\text{ }}to_{\text{ }}\angle6\colon\text{ Consecutive interior angles} \\ \angle3_{}suplementary_{\text{ }}to_{\text{ }}\angle4\colon\text{ adjacent angles over a straight line} \\ \angle7\cong\angle6\colon\text{ Vertical angles} \\ \end{gathered}[/tex]
