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# Geometry Vocab1

### Practice your Vocabulary!

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

Point | location in the space, and has no length, width, or thickness. |

Line | a straight one-dimensional figure having no thickness and extending infinitely in both directions containing at least two points |

Plane | a flat, two-dimensional surface that extends indefinitely, containing at least three noncollinear points |

Ray | to a line or segment with one fixed starting point (endpoint) and a direction. |

Segments | a part of a line containing two endpoints |

Opposite Rays | two rays that both start from a common endpoint and go off in exactly opposite directions |

Angles | formed from two straight lines or rays with a common endpoint (vertex). |

Complementary Angles | Two angles that have a sum of 90 degrees |

Supplementary Angles | Two angles that have a sum of 180 degrees |

Linear Pair | A set of supplementary angles that are also adjacent; two angles that form a straight line. |

Adjacent Angles | Angles that share a ray, and have no common interior points. |

Angle Bisector | A ray that partitions an angle into two equal (congruent) parts. |

Acute | An angle that measures less than 90 degrees. |

Angle Addition Postulate | The measure of a larger angle is the sum of the measures of the two smaller adjacent angles. |

Obtuse | An angle that measures more than 90 degrees. |

Right | An angle that measures exactly 90 degrees. |

Collinear | Points that lie on the same line. |

Coplanar | Points that lie within the same plane. |