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# Geometry Chapter 4

### Mcdougal Littell Vocab.

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

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 triangle with three acute angles. | acute triangle |

A triangle with three congruent angles. | equiangular triangle |

A triangle with one right angle. | right triangle |

A triangle with one obtuse angle. | obtuse triangle |

Each of the three points joining the sides of a triangle. | vertex of a triangle |

Two sides of a triangle with a common vertex. | adjacent sides of a triangle |

In a right triangle, the sides that form the right angle. | legs of a right triangle |

In a right triangle , the side opposite the right angle. | hypotenuse |

The two congruent sides of an isosceles triangle that has two congruent sides. | legs of an isosceles triangle |

When the sides of a triangle are extended, the three original angles of the triangle. | interior angle of a triangle |

When the sides of a triangle are extended, the angles that are adjacent to the interior angles. | exterior angles of a triangle |

A statement that can be proved easily using a theorem or a definition. | corollary |

there is a correspondence between their angles and sides | congruent |

When two figures are congruent, the angles that are in corresponding positions and are congruent. | corresponding angles of congruent figures |

When two figures are congruent, the sides that are in corresponding positions and are congruent. | corresponding sides of congruent figures |

The noncongruent side of an isosceles triangle that has only two congruent sides. | base angles of an isosceles triangle |

The angle opposite the base of an isosceles triangle. | vertex angle of an isosceles triangle |

A type of proof that involves placing geometric figures in a coordinate plane. | coordinate proof |

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dhmahlman