This lesson covers the different ways you can prove a quadrilateral is a parallelogram. It would be best to watch my video,
7.2 Part 1 - Properties of Parallelograms (Notes) because there is a lot of information in that video that would make this video easier to understand.
Lesson 7.3 (Part 2) Practice:
Properties of Parallelograms
This videos goes over practice problems related to Part 1 covering the different ways you can prove a quadrilateral is a parallelogram.