Lesson plan

Prove and apply relationships about the sides of parallelograms by using congruent triangles

teaches Common Core State Standards CCSS.Math.Content.HSG-CO.C.11 http://corestandards.org/Math/Content/HSG/CO/C/11

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Big Ideas: Prove that the opposite sides of parallelograms are congruent using congruent triangles. In this lesson students will work to prove a previously observed property of parallelograms. They will use their knowledge of transversals, parallel lines and congruent triangles to do so. Vocabulary: congruence, opposite sides, parallel, parallelogram Special Materials: None