Parallel Lines and Transversals: Lesson

This Parallel Lines and Transversals: Lesson video also includes:

Segment transversals proportionally. Given a diagram with three parallel lines and two transversals, the narrator of a short video points out the parallel lines cut the transversals proportionally. The portion of a long playlist on geometry provides examples of the theorem in action.

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CCSS: Adaptable
Instructional Ideas

  • Create a proof of the proportionality of segments of transversals between parallel lines
Classroom Considerations

  • Assumes pupils are familiar with the Triangle Proportionality Theorem
  • Individuals should be comfortable solving proportions

  • Show the mathematical steps in the examples
  • Links to practice in identifying parallel lines and transversals

  • None
Common Core