Lesson Plan

Ratios and Proportions with Congruent and Similar Polygons

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Investigate how similar and congruent figures compare. Learners understand congruent figures have congruent sides and angles, but similar figures only have congruent angles — their sides are proportional. After learning the relationships, pupils find missing measures.

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CCSS: Adaptable
Additional Tags
Instructional Ideas
  • Have your classes practice congruence, similarity, and proportionality statements before finding missing sides or angles
Classroom Considerations
  • Expects an understanding of solving proportions
  • Does not include examples for practice problems #15-16; supplement if appropriate for your classes
Pros
  • Teaching congruence and similarity together highlights the similar notation
  • Emphasizes vocabulary with definitions and examples
Cons
  • None
Common Core