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# Geometry Ch.4 part 1

### Vocabulary for Chapter 4 - Congruent Triangles - (part 1)

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

Triangle | A polygon with three sides. |

Scalene Triangle | A triangle with no congruent sides. |

Isosceles Triangle | A triangle that has, at most, two congruent sides. |

Equilateral Triangle | A triangle with three congruent sides. |

Acute Triangle | A triangle with all three angles measuring between 0 & 90 degrees. |

Right Triangle | A triangle with one angle measuring 90 degrees. |

Obtuse Triangle | A triangle with one angle measuring between 90 & 180 degrees. |

Equiangular Triangle | A triangle with three congruent angles. |

Vertex Angle | The noncongruent angle opposite the base of an isosceles triangle. |

Base Angles | The two angles that are adjacent to the base of an isosceles triangle. |

Base | The noncongruent side of an isosceles triangle. |

Legs | The two congruent sides of an isosceles triangle. |

Triangle Sum Theorem | The sum of the measures of the angles of a triangle is 180 degrees. |

Exterior Angle Theorem | The measure of each exterior angle of a triangle equals the sum of the measures of its two remote interior angles. |

Interior Angles | The orginial angles of a polygon after the sides are extended. |

Exterior Angles | The angles that form linear pairs with the interior angles. |

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hillap