This video covers the 7 different properties of parallelograms. All parallelograms have these 7 properties that make a quadrilateral a parallelogram.
If the quadrilateral doesn't have these properties, then it isn't a parallelogram.
Lesson 7.2 (Part 2) Practice:
Properties of Parallelograms
This videos goes over practice problems related to Part 1 covering the seven properties of parallelograms.