Let three Isoscelizers, one for each side, be constructed on a Triangle such that the four
interior triangles they determine are congruent. Now parallel-displace these Isoscelizers until they
concur in a single point. This point is called the Yff center of congruence and has Triangle Center Function

**References**

Kimberling, C. ``Yff Center of Congruence.'' http://cedar.evansville.edu/~ck6/tcenters/recent/yffcc.html.

© 1996-9

1999-05-26