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Prove theorems about parallelograms. Theorems include: opposite sides are congruent, opposite angles are congruent, the diagonals of a parallelogram bisect each other, and conversely, rectangles are parallelograms with congruent diagonals.Exercises from Illustrative MathematicsA set of exercises, commentary, and solutions. For this unit, choose:G-CO Midpoints of the Sides of a ParalellogramG-CO Is this a parallelogram?G-CO Parallelograms and Translations
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Teacher and Student versions of full lesson from engageNY
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Parallelogram Theorems

by Allen Wolmer

A number of Lessons, videos, exercises, and text from CK-12. Additional resources available at this site.
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