Point of concurrencey | | A ray that divides an angle into two adjacent angles that are congruent |

Median | | The perpendicular segment from a vertex of a triangle to the opposite side or to the line that contains the opposite side |

Circumcenter | | The point of concurrency of the angle bisectors of a triangle |

Midpoint | | A segment, ray, line, or plane that is perpendicular to a segment at its point |

Centroid | | The point of intersection of concurrent lines |

Itersect | | Two lines that intersect to form a right angle |

Perpendicular lines | | A segment whose endpoints are a vertex of the triangle and the midpoint of the opposite side |

Perpendicular bisector | | The point of concrurrency of the median of a triangle |

Orthorcenter | | The point of concurrency of the lines containing the altitudes of a triangle |

Concurrent lines | | The point that divideds, bisects, a segment into two congruent segments |

Angle bisector | | To have one or more points in common |

Midsegment | | Three or more lines that intersect in the same point |

Incenter | | The point of concurrency of the perpendiculare bisectors of a triangle |

Angle bisector | | A ray that divides an angle into two adjecent angles that are congruent |

Altitude | | A segment that connects the midpoints of two sides of a triangle |