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# NSA Geometry Ch1

### NSA Geometry Chapter 1

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

point, line, plane | undefined terms |

collinear | points on the same line are said to be this |

coplanar | points that lie on the same plane are said to be this |

line segment | portion of a line with two endpoints |

congruent segments | segments with the same measure |

midpoint | point that divides a segment into two congruent segments |

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

degree | unit of measure for an angle |

ray | part of a line with one endpoint extending indefinitely in one direction |

opposite rays | two rays that have a common endpoint and form a line |

angle | formed by two non-collinear rays that have a common endpoint |

vertex | common endpoint shared by two rays that form an angle |

right angle | measures 90 degrees |

acute angle | measures less than 90 degrees |

obtuse angle | measures between 90 and 180 degrees |

congruent angles | angles with the same measure |

angle bisector | ray that divides an angle into two equal angles |

adjacent angles | two angles in the same plane that share a common vertex and a common side, but no common interior points |

vertical angles | two nonadjacent angles formed by intersecting lines |

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

complementary angles | two angles whose measures have a sum of 90 degrees |

supplementary angles | two angles whose measures have a sum of 180 degrees |

perpendicular | lines that form right angles are said to be this |

point | names a location in space and has no size |

perimeter | sum of the lengths of the sides of a figure |

line | a straight path that has no thickness and extends forever |

plane | a flat surface that has no thickness and extends forever |

endpoint | a point at one end of a segment or ray |

diameter | segment that passes through the center of a circle and whose endpoints are on the circle |

radius | segment whose endpoints are the center of the circle and any point on the circle |

circumference | distance around a circle |

pi | irrational number which is the ratio of the circumference and diameter of a circle |

Created by:
jandslm