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# Geometry Quiz #3

### Terms to know for Geometry Quiz #3

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

Collinear Points | Points that lie on the same straight line or in a single line. |

Coplanar | Points that lie on the same plane. |

Line Segment | Part of a line that consists of two points, called endpoints. |

Ray | Part of a line that consists of a point called an initial point. |

Intersect/Bisect | When two geometric figures have one or more points in common. These points are called points of intersection (HALFS ARE EQUAL- to divide into two congruent points). |

Segment Addition Postulate | AC + CB = AB |

Congruent Segments | AB = AD refers to the length of the segment, while AB = AD with an ñ above it refers to the segments being equal. |

Acute Angle | Less than 90 degrees. |

Right Angle | 90 degrees. |

Obtuse angle | Between 90-180 degrees. |

Straight Angle | Exactly 180 degrees. |

Reflex Angle | Between 180-360 degrees. |

Adjacent | They share a common vertex and side, but NO common interior points. |

Midpoint | The point that divides the segment into two congruent segments. |

Angle Bisector | A ray that divides an angle into two adjacent angles that are congruent. |

Vertical Angles | Angles formed by two intersecting lines. Meaning, they share a common vertex and are across from each other. They also have the same measurement, since they are congruent. |

Supplementary Angles | Two angles that add up to 180 degrees. |

Linear Pair | If two adjacent angles are supplementary, then they are a linear pair (form a straight line). |

Complementary Angles | Two angles that add up to 90 degrees. |