Lesson plan

Recognize supplementary angles formed by parallel lines cut by a transversal by identifying and justifying which angles are supplementary and congruent

teaches Common Core State Standards CCSS.Math.Content.8.G.A.5 http://corestandards.org/Math/Content/8/G/A/5

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Big Ideas: An informal argument can show the angle relationships of parallel lines cut by a transversal. Equivalence of angles can be represented in many ways. In this lesson, students will focus on the same side interior angle relationship within the context of parallel lines intersected by a transversal. They will use the congruent angle relationships from the previous lesson (corresponding, alternate interior and alternate exterior). This lesson builds on prior knowledge of supplementary and vertical angles along with the corresponding, alternate interior and alternate exterior angle relationships from the previous lesson. Students begin to recognize that they can show angles are supplementary or congruent through multiple paths as long as they use appropriate justifications for their reasoning. Vocabulary: supplementary, same side interior, alternate interior, corresponding, alternate exterior, adjacent, linear pair, congruent, consecutive, opposite Special Materials: highlighters (optional)