Lesson plan

Solve for missing supplementary angles by writing equations

teaches Common Core State Standards CCSS.Math.Content.7.G.B.5 http://corestandards.org/Math/Content/7/G/B/5
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Big Ideas: Supplementary angle measurements add to 180 degrees. We can use supplementary angles to solve equations for unknown angles. This lesson builds on students’ previous work with decomposing angles and recognizing that angles measurements are additive. The task requires students to write and solve equations for unknown angles using their knowledge of supplementary angle measurements. The mathematical concepts in the lesson build toward student understanding of rotations, reflections, and translations. Vocabulary: complementary angles, supplementary angles, degrees, measurements Special Materials: handout pencil