Ratios and Proportions with Congruent and Similar Polygons

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
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