It's not a parallelogram until proven otherwise. Scholars learn about the conditions for a quadrilateral to be a parallelogram. They watch a video to see how to apply the conditions to prove that a given quadrilateral is a parallelogram.

Concepts

parallelograms, properties of parallelograms, geometric proofs, quadrilaterals

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Instructional Ideas

• Use the video as part of an intervention strategy
  

Classroom Considerations

• Third of seven lessons in the Geometry - Quadrilaterals and Polygons unit
• Prior experience with two-column proofs is beneficial
  

• This video is hosted on YouTube

Pros

• Practice packet includes the examples from the video to help students take notes 
• Uses color to help distinguish relevant lines and angles
  

Cons

• None

Common Core

HSG-CO.C.11