If two parallel lines are intersected by a transversal,
then the corresponding angles are congruent.
__________________1/2__________
3 / 4
/
______________5_/6___________
7 / 8
1. / 4 = / 5 1. The Alternate Angle Postulate
2. / 5 = / 8 2. Vertical Angles are equal.
3. / 4 = / 8 3. Transitive Property