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.

Concepts

parallel lines, parallel lines with a transversal, proportions, proportional reasoning

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Additional Tags

math

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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

• This video is hosted on YouTube

Pros

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

Cons

• None

Common Core

HSG-SRT.B.5 MP3 MP6