Dynamic Geometry: Nine Point Circle or Euler's Circle or Feuerbach
Circle of a Triangle.
HTML5 Animation for Tablets
Nine Point Circle or Euler's
Circle or Feuerbach Circle
The nine point circle of a triangle ABC is the circle that passes through
nine significant concyclic points: the feet H_{A}, H_{B}, and H_{C},
of the altitudes,
the midpoints M_{A}, M_{B}, and M_{C}, of each
side and the midpoints E_{A}, E_{B}, and E_{C } of
the segment from each vertex to the orthocenter.
