Preparation for joint work, connecting dynamic geometry with proof and construction tools

Midpoint using the butterfly theorem

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Midpoint using the butterfly theorem

This is a simple looking example, but at a closer look, the butterfly theorem belongs to projective geometry.

The butterfly theorem
Specification

Text:

Specification:

  • given : TODO
  • precondition : TODO
  • find : TODO
  • postcondition : TODO
Program in GCL