# Geometry Ch. 4 Terms

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

Acute Triangle | A triangle in which all of the angles are acute angles. |

Auxiliary Line | An extra line or segment drawn in a figure to help complete a proof. |

Base Angles | The two angles formed by the base and the congruent sides |

Congruence Transformation | A mapping for which a geometric figure and its image are congruent. |

Congruent Polygons | Polygons in which all matching parts are congruent. |

Coordinate Proof | Proofs that use figures in the coordinate plane and algebra to prove geometric concepts. |

Corollary | A statement that can be easily proved using theorem is called a corollary of that theorem. |

Corresponding Parts | Matching parts of congruent polygons. |

Equiangular Triangle | A triangle with all angles congruent. |

Equilateral Triangle | A triangle with all sides congruent. |

Exterior Angle | An angle formed by one side of a triangle and the extension of another side. |

Flow Proof | A proof that organizes statements in logical order, starting with the given statements. |

Included Angle | In a triangle, the angle formed by two sides is the included angles for those two sides. |

Included Side | The side of a polygon that is a side of each two angles. |

Isosceles Triangle | A triangle with at least two sides that are congruent. |

Obtuse Triangle | A triangle with an obtuse angle. |

Reflection | A transformation representing the flip of a figure over a point, line or plane. |

Remote Interior Angles | The angles of a triangle that are not adjacent to a given exterior angle. |

Right Triangle | A triangle with a right angle. |

Rotation | A transformation that turns every point of a preimage through a specified angle and angle and direction about a fixed point or center of rotation. |

Scalene Triangle | A triangle with no two sides congruent. |

Translation | A transformation that moves a figure the same distance in the same direction. |

Vertex Angle | The angle with sides that are the legs |

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