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# Geometry Triangles

Term | Definition |
---|---|

equilateral triangle | a triangle whose three sides are equal in length |

isosceles triangle | a triangle with two sides that are equal in length |

scalene triangle | a triangle whose three sides are all different in length |

acute triangle | a triangle whose 3 angles are all less than 90 degrees |

equiangular triangle | a triangle whose 3 angles are equal |

right triangle | a triangle with one angle of 90 degrees |

obtuse triangle | a triangle with an angle of more than 90 degrees |

hypotenuse | the side opposite the right angle in a right triangle |

base of an isosceles triangle | the side of an isosceles triangle that is not the legs (the two sides that are congruent) |

base angles of an isosceles triangle | the two congruent angles on an isosceles triangle |

corollary | a theorem that follows from another theorem |

perpendicular bisector of a triangle | a perpendicular line through the midpoint of a side of the triangle |

angle bisector of a triangle | a line that divides an angle of the triangle into two congruent parts |

point of concurrency | the point where three or more lines intersect |

concurrent lines | when three or more lines intersect in the same point |

circumcenter of a triangle | the point of concurrency of the perpendicular bisectors of a triangle |

incenter of a triangle | the point of concurrency of the angle bisectors |

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

centroid of a triangle | the point of concurrency of the three medians of a triangle |

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

orthocenter of a triangle | the point of concurrency of the three altitude lines |

mid segment of a triangle | a segment that connects the midpoints of two sides of a triangle |

vertex angle of an isosceles triangle | the angle that is not congruent to the others in an isosceles triangle |

Created by:
abby_eck