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

Answer:
Angle 2 is a supplementary angle with 17°, so m∠2 = 163°. Since ∠1 and ∠2 are alternate interior angles of parallel lines, they are congruent, and the m ∠1 = m ∠2. Thus, m∠1 = 163°.