The point at which the Incircle and Nine-Point Circle are tangent. It has Triangle Center Function

**References**

Johnson, R. A. *Modern Geometry: An Elementary Treatise on the Geometry of the Triangle and the Circle.* Boston, MA:
Houghton Mifflin, p. 200, 1929.

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

Salmon, G. *Conic Sections, 6th ed.* New York: Chelsea, p. 127, 1954.

© 1996-9

1999-05-26