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# Math Triangle stuff

Question | Answer |
---|---|

Concurrent lines | 2 or more lines that intersect in one point |

Point of concurrency | the intersection point |

Centroid | the point of concurrency of the medians of a triangle |

Median | a segment that joins a vertex of a triangle to the midpoint of the opposite side |

Circumcenter | point of concurrency of the perpendicular bisectors of the sides of a triangle |

Incenter | point of concurrency of the bisectors of the angles of a triangle |

Orthocenter | point of concurrency of the altitudes of a triangle |

altitude | a perpendicular segment from a vertex of the triangle to the line containing the opposite side |

Equilateral | 3 congruent sides |

Isosceles | at least 2 congruent sides |

Scalene | no congruent sides |

Equiangular | 3 congruent angles |

Acute | 3 acute angles |

Obtuse | 1 obtuse angle |

Right | 1 right angle |

3 sides | triangle |

4 sides | quadrilateral |

5 sides | pentagon |

6 sides | hexagon |

7 sides | heptagon |

8 sides | octagon |

9 sides | nonagon |

10 sides | decagon |

11 sides | hendecagon |

12 sides | dodecagon |

5 segments associated with a triangle | 1. perpendicular bisectors 2. angle bisectors 3. medians 4. altitudes 5. midsegments |

perpendicular bisector | a segment that is perpendicular to a side of a triangle at the midpoint of the side |

angle bisector | a segment that bisects an angle of a triangle |

median | a segment whose endpoints are a vertex of the triangle and the midpoint of the opposite side |

altitude | the perpendicular segment from a vertex to the opposite side or a line containing the opposite side |

midsegment | segment that connects the midpoints of any two sides of a triangle |

Created by:
emilyradke