Chapter 3 - Parallel and Perpendicular Lines - 3-1 Lines and Angles - Practice and Problem-Solving Exercises - Page 144: 17

$\angle 7$ and $\angle 6$ $\angle 2$ and $\angle 5$

For $\angle 7$ and $\angle 6$, the two lines are line a and line b. The transversal is line d. For $\angle 2$ and $\angle 5$, the two lines are line b and line c. The transversal is line e.