The Locus of the centers of all Conics through the Vertices and Orthocenter of a Triangle (which are Rectangular Hyperbolas when not degenerate), is a Circle through the Midpoints of the sides, the points half way from the Orthocenter to the Vertices, and the feet of the Altitude.

**References**

Coolidge, J. L. *A Treatise on Algebraic Plane Curves.* New York: Dover, p. 198, 1959.

© 1996-9

1999-05-26