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### Missing problem for Book CC3 => Chapter Ch9 => Lesson 9.1.2 => Problem 9-22

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Angle 4 is supplementary with angle 2, which corresponds to angle 6. Since the lines cut by the transversal are parallel, corresponding angles are equal.

Angle 1 and angle 4 are vertical angles, which are always equal. In addition, angle 4 and angle 8 are corresponding angles.

*m*∠1 = *m*∠4

*m*∠4 = *m*∠8

Angle 2 and angle 6 are corresponding angles. Since the lines are parallel, they will have equal measure. Angle 6 and angle 8 are supplementary.