Yff Center of Congruence
Let three Isoscelizers, one for each side, be constructed on a Triangle such that the fourinterior triangles they determine are congruent. Now parallel-displace these Isoscelizers until theyconcur in a single point. This point is called the Yff center of congruence and has Triangle Center Function
See also Congruent Isoscelizers Point, Isoscelizer
References
Kimberling, C. ``Yff Center of Congruence.''http://cedar.evansville.edu/~ck6/tcenters/recent/yffcc.html.
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