## Nine point circle

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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Categories: Mathematica, Mathematics

A CDF is here: http://ubpdqn.blogspot.com.au/2011/10/nine-point-circle.html