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.

Concepts

congruence, similarity, transformations, translations, reflections, rotations

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Additional Tags

math

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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

Pros

• Graphs are well drawn and look professional
• Learners investigate properties of transformations rather than simply hear them from the teacher

Cons

• Unlike other chapters in the series, the table of contents does not include links to directly access lessons

Common Core

8.G.A.1.a 8.G.A.1.b 8.G.A.1.c 8.G.A.2 8.G.A.3 8.G.A.4