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# Geometry-Chapter 4

### Geometry-Chapter 4 Vocabulary

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

a polygon with three sides | triangle |

a triangle with no congruent sides | scalene triangle |

a triangle with at least two congruent sides | isosceles triangle |

a triangle with three congruent sides | equilateral triangle |

a triangle with all three internal angles measuring between 0 and 90 degrees | acute angle |

a triangle with one internal angle measuring 90 degrees | right triangle |

a triangle with one internal angle with measuring between 90 and 180 degrees | obtuse triangle |

a triangle with three conguent angles | equiangular triangle |

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

when the sides of a triangle are extended, the three original angles of the triangle | interior angles |

a statement that can be proved easily using a theorem | corollary |

two geometric figures that have exactly the same size and shape | congruent figures |

A pair of sides or angles that have the same relative position in two congruent or similar figures | corresponding parts |

a type of proof that uses arrows to show the flow of a logical argument | flow proof |

an operation that moves or changes a geomeric figure in some way to produce a new figure | transformation |

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

In a right triangle, the sides adjacent to the right angle | legs |

The two congruent sides of an isosceles triangle | legs |

The noncongruent side of an isosceles triangle | base |

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

A transformation that uses a line of reflection to create a mirror image of the original figure | reflection |

A transformation in which a figure is turned about a fixed pont called the center of rotation | rotation |

A transformation that moves every point of a figure the same distance in the same direction | translation |

In a transformation the term often used to refer to the original figure | preimage |

The new figure that is produced in a transformation | image |

A congruent transformation where all side lengths and angle measurements a remain the same | isometry |

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

Created by:
aelohaus