Lesson plan

Identify pairs of supplementary 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: Supplementary angles add up to 180 degrees. Supplementary 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 supplementary angles to find missing angle measurements in a diagram in order to draw conclusions about the safety of street intersections. The mathematical concepts in the lesson build toward student understanding of rotations, reflections, and translations. Vocabulary: supplementary angles, intersection, supplementary angle pairs, degrees, straight line Special Materials: Street Map handout pencil