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# NorthCrawford GeoCh1

### Tools of Geometry

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

net | Two-dimensional diagram that you can fold to form a three-dimensional figure |

isometric drawing | drawing that shows the corner view of a three-dimensional figure |

orthographic drawing | another way to represent a three-dimensional figure |

point | indicates a location and has no size |

line | a straight path that extends in two opposite directions without an end and has no thickness |

plane | flat surface that extends without an end and has no thickness |

collinear points | points that lie on the same line |

coplanar | points and lines that lie in the same plane |

ray | part of a line that only has one endpoint |

opposite rays | two rays that share the same endpoint and form a line |

space | set of all points in a three-dimensional figure |

segment | part of a line that has two endpoints |

postulate | accepted statement of fact |

axiom | accepted statement of fact |

segment bisector | the point, line, or segment that bisects another line or segment |

vertex of an angle | endpoint of an angle |

measure of an angle | Consider ray OD and point C on one side of ray OD. Every ray of the form ray OC can be paired one to one with a real number from 0 to 180. The measure of angle COD is the absolute value of the difference of the real numbers paired with ray OC and ray OD |

congruent angles | angles that are equal |

acute angles | angle that is less than 90 degrees |

right angles | angle that equals 90 degrees |

obtuse angles | angle that is more than 90 degrees |

straight angles | angle that is equal to 180 degrees |

vertical angles | two angles whose sides are opposite rays |

supplementary angles | two angles that have the sum of 180 degrees |

complementary angles | two angles that have the sum of 90 degrees |

adjacent angles | two coplanar angles with a common side or vertex and no common interior points |

linear pair | pair of adjacent angles whose noncommon sides are opposite rays |

angle bisector | line or segment that divides an angle in half |

construction | geometric figure drawn using a straightedge or compass |

perpendicular lines | two lines that intersect forming right angles |

perpendicular bisector | line, segment, or ray that is perpendicular to the segment at its midpoint |

congruent segments | segments that are the same length |

intersection | set of points the figure has in common |

coordinate | the number that corresponds to a point |

distance | area between two points |

midpoint | the center of a point, line, or any other segment |

Created by:
mbuening