Carmen is planning rail lines for a new train station. Help her find m1. Explain how you found that solution.

Answer:

Angle 2 and the angle labeled 17° are supplementary angles because they form a linear pair, so m∠2 + 17° = 180°, which means m∠2 = 163°. Since the rail lines are parallel, ∠1 and ∠2 are alternate interior angles, which are congruent. Therefore, m∠1 = m∠2 = 163°.