Lesson plan

Determine if figures are similar by using similarity transformations

teaches Common Core State Standards CCSS.Math.Content.HSG-SRT.A.2 http://corestandards.org/Math/Content/HSG/SRT/A/2
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP3 http://corestandards.org/Math/Practice/MP3
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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Big Ideas: We can use transformations to change the size of a figure. Students will use their understanding of transformations and similarity to map one figure onto another. They will use their prior knowledge of isometry and dilations to determine how a figure is changed. This lesson leads to lessons about the applications of similar figures and how they can be used to solve problems with indirect measurement. Vocabulary: Similarity, dilate, scale factor, center of dilation, proportionality, pre-image, image, prime, double prime, etc., D k(x, y) = (kx, ky) Special Materials: Graph paper, Ruler