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We will learn 2 postulates on parallel lines and corresponding angles.
Postulate: If 2 lines are cut by a transversal so that the corresponding angles are congruent, then the lines are parallel.
Postulate (Converse of the first postulate): If 2 parallel lines are cut by a transversal then corresponding angles are congruent.

Previous video in this series on YouTube: https://youtu.be/uj5DgfIuU40
Title: Geometry - Ch. 4: Lines and Angles (29 of TBD) Transversals and Angles: Ex. 15

Next video in this series on YouTube: https://youtu.be/qe3MwrViTWU
Title: Geometry - Ch. 4: Lines and Angles (31 of TBD) Parallel Lines and Corresponding Angles Ex. 1