1. Measure of angle 6 must be 50 degrees.
2. Angles 2 and 10 must have the same measurement since they are corresponding, also, the angles 9 and 11 are corresponding. Since 9 and 10 are suplementary we have the next equations
[tex]\begin{gathered} m\measuredangle2=m\measuredangle10 \\ m\measuredangle9=m\measuredangle11 \\ m\measuredangle9+m\measuredangle10=180 \end{gathered}[/tex]
Then
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