The Side-Angle-Side (SAS) and Side-Side-Side (SSS) Criteria for Two Triangles to Be Similar

Playing with mathematics can invoke curiosity and excitement. As pupils construct triangles with given criteria, they determine the necessary requirements to support similarity. After determining the criteria, they practice verifying similarity of given figures. 

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CCSS: Designed
Instructional Ideas

  • Incorporate graphic organizers to record conclusions from the lesson
Classroom Considerations

  • Requires construction tools and a protractor or patty paper
  • Assumes an understanding of congruence criteria 
  • Number 17 in a series of 36 lessons

  • Emphasizes vocabulary and notation in written statements
  • Teacher guide includes suggestions for scaffolding and critical thinking questioning

  • None