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# Geo_1.1

### Vocabulary for Geometry_1.1

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

acute angle | An angle with a degree measure less than 90. |

adjacent angles | Two angles that lie in the same plane, have a common vertex and a common side, but no common interior points. |

angle | The intersection of two noncollinear rays at a common endpoint. The rays are called sides and the common endpoint is called the vertex. |

collinear | Points that lie on the same line. |

complementary angles | Two angles with measures that have a sum of 90. |

construction | A method of creating geometric figures without the benefit of measuring tools. Generally, only a pencil, straightedge, and compass are used. |

coplanar | Points that lie in the same plane. |

congruent segments | Line segments that have the same measure. |

defined term | Term explained using undefined terms and/or other defined terms. |

definition | Term explained using undefined terms and/or other defined terms. |

degree | A unit of measure used in measuring angles and arcs. An arc of a circle with measure of 1° is 1/360 of the entire circle. |

distance | The length of the segment between two points. |

intersection | A set of points common to two or more geometric figures. |

line segment | A measurable part of a line that consists of two points, called endpoints, all all the points between them. |

line | A basic undefined term of geometry. A line is made up of points and has no thickness or width. In a figure, a line is shown with an arrowhead at each end. Lines are usually named by lowercase script letters or by writing capital letters for two points on the line, with a double arrow over the pair of letters. |

linear pair | A pair of adjacent angles whose non-common sides are opposite rays. |

midpoint | The point on a segment exactly halfway between the endpoints of the segment. |

obtuse angle | An angle with degree measure greater than 90 and less than 180. |

perpendicular | Lines, segments, or rays that form right angles. |

plane | A basic undefined term of geometry. A plane is a flat surface made up of points that has no depth and extends indefinitely in all directions. In a figure, a plane is often represented by a shaded, slanted four-sided figure. Planes are usually named by a capital script letter or by three noncollinear points on the plane. |

point | A basic undefined term in geometry. A point is a location. In a figure, points are represented by a dot. Points are named by capital letters. |

ray | A part of a line with one endpoint and extends indefinitely in one direction. |

right angle | An angle with degree measure of 90. |

segment bisector | A segment, line, or plane that intersects a segment at its midpoint. |

space | A boundless, three-dimensional set of all points. |

supplementary angles | Two angles with measures that have a sum of 180. |

undefined term | Terms only explained by examples and descriptions. |

vertex | A common endpoint. |

vertical angles | Two nonadjacent angles formed by two intersecting lines. |

Created by:
mtoepper