Conjectures and Proof

This Conjectures and Proof interactive also includes:

Transform proofs using triangle rotations. By rotating a triangle around various points, class members develop proofs. Participants prove relationships of alternative interior angles formed by parallel lines and the sum of the interior angles of a pentagon.

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CCSS: Adaptable
Instructional Ideas

  • Create groups to share the sequences used to answer the questions
  • Demonstrate how to use each of the tools prior to the activity
Classroom Considerations

  • The class should be familiar with rotations as transformations

  • Provides initial directions on how to use the tools
  • Contains sliders for multiple rotations

  • None