Given the figure in the attached image.
[tex]\begin{gathered} m\angle1=m\angle3 \\ m\angle2=50^{\circ} \end{gathered}[/tex]
Reason: vertically opposite angles are equal.
Also;
[tex]50^{\circ}+m\angle1=180^{\circ}[/tex]
Reason: supplementary angles.
solving for angle 1;
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