Given: Angle 1 = Angle 2

Prove:
L || M

Match-

1. Angle 1 = Angle 2
2. Angle 1 = Angle 3
3. Angle 2 = Angle 3
4. L || M

A. Given
B. Substitution
C. If corresponding are equal, than lines are parallel
D. Vertical angles are equal.