Geometry: Transformations, Congruence, and Similarity

Rigid motions are to congruence as what are to similarity? Investigate properties of rigid motions and define congruence in terms of rigid motions with the ninth chapter of a 10-part eighth grade workbook series. The lesson then prompts learners to investigate dilations and to define similarity in terms of similarity transformations.

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CCSS: Designed
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Instructional Ideas
  • Use the resource to plan a unit on congruence and similarity transformations
  • Have learners create charts to keep track of properties for each transformation
Classroom Considerations
  • Learners should already be familiar with coordinate points, writing equations of lines, and dilations
  • Graphs are well drawn and look professional
  • Learners investigate properties of transformations rather than simply hear them from the teacher
  • Unlike other chapters in the series, the table of contents does not include links to directly access lessons