Let points , , and be marked off some fixed distance along each of the sides , , and .
Then the lines , , and concur in a point known as the first Yff point if

(1) |

(2) |

(3) | |||

(4) | |||

(5) |

The Isotomic Conjugate Point is called the second Yff point. The Triangle Center Functions of the first and second points are given by

(6) |

(7) |

(8) |

(9) |

Yff (1963) gives a number of other interesting properties. The line is Perpendicular to the line containing
the Incenter and Circumcenter , and its length is given by

(10) |

**References**

Yff, P. ``An Analog of the Brocard Points.'' *Amer. Math. Monthly* **70**, 495-501, 1963.

© 1996-9

1999-05-26