Lesson plan

Identify pairs of complementary angles by using known angle measurements

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: Complementary angles are angles with measures that add up to 90 degrees. Complementary angles can be used to find the measures of 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 find missing angles in a diagram and list complementary angle pairs. The mathematical concepts in the lesson build toward student understanding of rotations, reflections, and translations. Vocabulary: measure, degrees, complementary angle, complementary angle pairs, right angle Special Materials: handout pencil