Answer :

The angles 1 and 5 have the same measure, since they are corresponding angles.

Then:

[tex]m\angle5=123^{\circ}[/tex]

The angles 5 and 6 are supplementary angles, this means that their measures add up to 180°. Then:

[tex]\begin{gathered} m\angle5+m\angle6=180 \\ \Rightarrow123+m\angle6=180 \end{gathered}[/tex]

Substract 123 from both sides of the equation:

[tex]\begin{gathered} m\angle6=180-123 \\ =57 \end{gathered}[/tex]

Therefore, the measure of the angle 6 is 57°.

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Rewritten by : Barada