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# Chapter 4

### Triangle congruence

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

a line drawn in a figure to aid in a proof. | Auxiliary Line |

A triangle with three acute angles | Acute Triangle |

A triangle with three congruent acute angles | Equiangular Triangle |

A triangle with one right triangle | Right Triangle |

A triangle with one obtuse triangle | Obtuse Triangle |

A triangle with three congruent sides | Equilateral Triangle |

A triangle with at least two congruent sides | Isosceles Triangle |

A triangle with no congruent sides | Scalene Triangle |

A theorem whose proof follows directly form another theorem. | Corollary |

The set of all points inside a figure | Interior |

The set of all points outside a figure | Exterior |

An angle formed by two sides of a triangle | Interior Angle |

An angle formed by one side of the triangle and the extension of an adjacent side | Exterior Angle |

An interior angle that is not adjacent to the exterior angle | Remote interior angle |

Angels in the same position in two different polygons that have the same number of angles. | Corresponding angles of polygons |

Sides in the same position in two different polygons that have the same number of sides. | Corresponding sides of polygons |

Two polygons whose corresponding sides and angles are congruent. | Congruent polygons |

A property of triangles that states that if the side lengths of a triangle are fixed, the triangle can have only one shape. | Triangle rigidity |

An angle formed by two adjacent sides of a polygon. | Included angle |

The common side of two consecutive angles in a ploygon. | Included side |

CPCTC | Corresponding Parts of Congruent Triangles are Congruent. |

Congruent sides of an isosceles triangle | Legs |

The angle formed by the legs | Vertex angle |

The side opposite the vertex angle | Base |

The two angles that have the base as a side | Base angles |

Created by:
bhsgeometry