Nine-point hyperbola
0In plane geometry with triangle ABC, the nine-point hyperbola is an instance of the nine-point conic described by Maxime Bôcher in 1892. The celebrated nine-point circle is a separate instance of Bôcher's conic:
Given a triangle ABC and a point P in its plane, a conic can be drawn through the following nine points:
the midpoints of the sides of ABC,
the midpoints of the lines joining P to the vertices, and
the points where these last named lines cut the sides of the triangle.The conic is an ellipse if P lies in the interior of ABC or in one of the regions of the plane separated from the interior by two sides of the triangle; otherwise, the conic is a hyperbola. Bôcher notes that when P is the orthocenter, one obtains the nine-point circle, and when P is on the circumcircle of ABC, then the conic is an equilateral hyperbola.
Source: https://en.wikipedia.org/wiki/Nine-point_hyperbola
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