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# Essentials of Geom

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

Point | A point has no dimension. It is usually represented by a dot. |

Plane | A plane has two dimensions. It is usually represented by a shape that looks like a floor or wall. |

Ray | Part of a line that consists of a point called an endpoint and all points on the line that extend in one direction. |

Vertical Angles | Two angles whose sides form two pairs of opposite rays. |

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

Angle | : Consists of two different rays with the same endpoint. The rays are the sides of the angle and the endpoint is the vertex of the angle. |

Collinear Points | Points that lie on the same line. |

Coplanar Points | Points that lie on the same plane. |

Adjacent Angles | Two angles that share a common vertex and side, but have no common interior points. |

Opposite Rays | Two rays with a common endpoint that point in opposite directions. |

Line | A line has one dimension. It is usually represented by a straight line with two arrowheads to indicate that the line extends without end in two directions. |

Line Segment | : Part of a line that consists of two points, called endpoints, and all points on the line that are between the endpoints. |

Linear Pair | Two adjacent angles whose non-common sides are opposite rays. |

Obtuse Angle | An angle with measure between 90 and 180 degrees. |

Right Angle | An angle with measure equal to 90 degrees. |

Non-Coplanar Points | Points that do not lie on the same plane. |

Non-Collinear Points | Points that do not lie on the same line. |

Supplementary Angles | Two angles whose measures have the sum 180 degrees. The sum of the measures of an angle and its supplement is 180 degrees. |

Complementary Angles | : Two angles whose measures have the sum 90 degrees. The sum of the measures of an angle and its complement is 90 degrees. |

Vertex | The same endpoint of two rays that form an angle. |

Acute Angle | An angle whose measure is between 0 and 90 degrees. |

Straight Angle | An angle whose measure is 180 degrees. |

Created by:
SuzyMahoney