Lesson plan

Solve for missing complementary 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: Use complementary angles to write and solve equations for unknown angles. This lesson builds on students’ previous work with decomposing angles and recognizing that angle measurements are additive. The task requires students to use their knowledge of complementary angle measurements to write equations to solve for unknown angles. The mathematical concepts in the lesson build toward student understanding of rotations, reflections, and translations. Vocabulary: right angles, degrees, complementary, complementary angles, equations