## Congressus Numerantium, Volumes 129-131 |

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### Contents

A ABC the reference triangle Art 1 1 p | 1 |

VP Q the Qparallel image of P Art 5 | 5 |

WP inconic associated with point P Art 8 | 8 |

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### Common terms and phrases

A-vertex AABC actual trilinear distances anticevian triangle anticomplementary triangle antipedal triangle Brocard point center of perspective central line central triangle centroid cevian triangle Chapter circumcenter circumcevian triangle circumcircle circumperp triangle collinear conjugate of Xm construction cos(B cosC cross-cevian point csc(A csc(C defined eigencenter equation equilateral triangle Euler line example excentral triangle excircles Feuerbach Find trilinears functions given harmonic conjugates homothetic incenter incircle inverse isogonal isotomic conjugate line at infinity lines AA Mathematical medial midpoint Morley triangle nine-point circle orthic triangle orthocenter parallel passes through Xi pedal triangle perpendicular perspective to AABC plane of AABC point of intersection polynomial center Problem proof Prove real numbers reference triangle respectively segment sidelengths sideline BC sideline of AABC sin(A Suppose tangential triangle Theorem triangle ABC triangle centers triangle geometry triangle of type triangle of Xi trilinear coordinates vertex vertices X2-Ceva conjugate