False Proof: All triangles are isosceles

  • BM = MC
  • Angle BMP = Angle PMC = Pi/2
  • Angle BAP = Angle PAC
    When this picture was drawn out on the blackboard, it was drawn incorrectly leading us to believe that the proof was true. This Cinderella drawing shows that the blackboard drawing was wrong.

    Please enable Java for an interactive construction (with Cinderella).
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