The center (or ) of the Nine-Point Circle. It has Triangle Center Function

and is the Midpoint of the line between the Circumcenter and Orthocenter . It lies on the Euler Line.

**References**

Carr, G. S. *Formulas and Theorems in Pure Mathematics, 2nd ed.* New York: Chelsea, p. 624, 1970.

Dixon, R. *Mathographics.* New York: Dover, pp. 57-58, 1991.

Kimberling, C. ``Central Points and Central Lines in the Plane of a Triangle.'' *Math. Mag.* **67**, 163-187, 1994.

Kimberling, C. ``Nine-Point Center.'' http://cedar.evansville.edu/~ck6/tcenters/class/npcenter.html.

© 1996-9

1999-05-25