Triangle Proportionality Theorem

Parallel lines through triangles result in a special proportion. Scholars prove the triangle proportionality theorem in a great lesson. The resource makes use of angle relationships and the similarity criteria to build on their geometry skills.

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CCSS: Designed
Instructional Ideas

  • Use the worksheet as homework
Classroom Considerations

  • Pupils should have experience with proof techniques
  • Learners must be able to understand proportions and similarity criteria
Pros

  • Well-drawn diagram makes concept clear
  • Lists some questions to elicit thinking
Cons

  • Sample responses in rubric are illegible
Common Core