Completing Proofs Involving Congruent Triangles with Parallel or
Angle Properties, Postulates, and Theorems - Wyzant Lessons
Alternate Interior Angles Definition & Theorem - Video & Lesson
Alternate Interior Angles Definition & Theorem - Video & Lesson
Exterior Angle Theorem - Definition, Proof, Examples
Definition--Theorems and Postulates--Alternate Interior Angles
Corresponding Angles Theorem & Examples
Alternate Interior Angles Theorem - Definition, Properties, Proof
Alternate Interior Angles Definition & Theorem - Video & Lesson
Same-Side Exterior Angles: Definition & Theorem - Video & Lesson
Angle Properties, Postulates, and Theorems - Wyzant Lessons