Triangle Proportionality: Lesson

This Triangle Proportionality: Lesson video also includes:

Look at proportionality from a parallel perspective. A section of an expansive geometry playlist introduces the Triangle Proportionality Theorem. Using the theorem, the video shows how to determine missing measurements in triangles.

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CCSS: Adaptable
Instructional Ideas

  • Prove the Triangle Proportionality Theorem
Classroom Considerations

  • Individuals should know properties of parallel lines
  • Pupils need to be comfortable with solving proportions

  • Shows the algebra required to solve the proportions in the examples
  • Links to other CK-12 resources on triangle proportionality

  • None
Common Core