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Green Geometry : Euler Line and Nine-point circle

Author:Lionel GERVAIS
Watch the following YouTube videos from Norman J. Wildberger:
  • Green geometry (I) | WildTrig: Intro to Rational Trigonometry | N J Wildberger
  • Green geometry (II) | WildTrig: Intro to Rational Trigonometry | N J Wildberger
Move the points A1, A2 or A3 of the triangle.

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