Lesson plan

Finding reduced and enlarged triangle areas by using scale factors

teaches Common Core State Standards CCSS.Math.Content.7.G.A.1 http://corestandards.org/Math/Content/7/G/A/1
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4
teaches Common Core State Standards CCSS.Math.Practice.MP6 http://corestandards.org/Math/Practice/MP6
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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Big Ideas: Dimensions of triangles can be reduced or enlarged by using proportional reasoning and a scale factor. This lesson builds on students’ previous work using proportional reasoning to find new dimensions and includes previous learning for finding area of a geometric figure. The task requires students to find the dimensions for a triangle that has been reduced from the original and another triangle that has been enlarged from the original. Once students find these dimensions, they can use previous knowledge for finding the area of a triangle. Vocabulary: scale drawing scale factor dimensions length area enlarge reduce Special Materials: colored pencils graph paper