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Nine point circle

Posted by ubpdqn on December 25, 2010

The following video shows:

  • triangle and its median triangle
  • the circumcentre of the median triangle
  • the orthocentre of the triangle (green point)
  • the nine point circle (red)
  • the nine points
    • three blue points: the vertices of the median triangle
    • three purple points: the points of orthogonal projections of vertex onto opposite side
    • three orange points: Euler points

A more detailed rendering:

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