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# GeometryAB

### Mrs. Brown

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

point | It is represented by a dot and named by a capital letter. It represents position. |

line | a connected set of infinitely many points and extends infinitely in two opposite directions |

plane | an infinite set of points forming a connected flat surface and extends infinitely in all directions |

postulate | a statement that is assumed true without proof |

theorem | a statement that can be proven |

line segment | a connected piece of a line with two endpoints and is named by its endpoints |

midpoint | a line segment that is the half way point from the endpoints |

ray | a piece of a line with only one endpoint and continues forever in one direction |

angle | two rays with the same endpoint |

degrees | an angle is measured by |

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

right angle | an angle that measures 90 degrees |

acute angle | an angle that measures less than 90 degrees |

obtuse angle | an angle that measures greater than 90 degrees |

straight angle | an angle that measures 180 degrees |

adjacent angle | two angles that share a common side and share a common vertex |

vertical angle | formed when two lines intersect and form four angles...these angles are not adjacent angles |

complementary angles | two angles whose sum is 90 degrees |

supplementary angles | two angles whose sum is 180 degrees |

intersecting lines | two or more lines that meet at a point |

perpendicular lines | two lines that intersect and form right angles |

parallel lines | two lines, both in the same plane,that never intersect, and remain the same distance apart at all times |

parallel planes | two planes that do not intersect |

equiangular triangle | a triangle having all angles of equal measure |

equilateral triangle | a triangle with all three sides equal in measure |

isosceles triangle | a triangle in which at least two sides have equal measure |

scalene triangle | a triangle with all three sides of different measure |

altitude of an angle | angle height |

triangle | three-sided polygon |

quadrilateral | four-sided polygon |

pentagon | five-sided polygon |

hexagon | six-sided polygon |

heptagon | seven-sided polygon |

octagon | eight-sided polygon |

nonagon | nine-sided polygon |

decagon | ten-sided polygon |

perimeter | the total distance around an object or a shape |

area |

Created by:
ng