The Perspective Centers of a triangle and the Tangential Triangles of its inner and outer Soddy Circles, given by

where is the Incenter and

**References**

Oldknow, A. ``The Euler-Gergonne-Soddy Triangle of a Triangle.'' *Amer. Math. Monthly* **103**, 319-329, 1996.

© 1996-9

1999-05-26