Video 1 of 4 Proving Lines Parallel - Converse of Same-Side Angle Theorems
Video 2 of 4: Converse of Corresponding Angle Postulate and the Alternate Angle Theorems
Video 3 of 4: Proofs including two column proof
Video 4 of 4: Perpendicular Transversal Theorem and other forms of proof. Notes end after the Perpendicular Transversal Theorem.