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# geometry val

### chapter 1 leson 1.1, 1.2,1.3

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

conjecture | an unproven statement that is based on observation |

point | a point has no dimension. it is usually represented by a small dot |

line | is defined by 2 points; a line extends in one dimension; usually represented by a straight line with two arrow heads to indicate that the line extends without end in two directions |

plane | is defined by 3 points; a plane extends in two dimensions; is usually represented by a shape that looks like a tabletop or a wall |

line segment | part of a line that consists of two ponts called endpoints and all point on the line that are in between the endpoints; segment |

ray | part of a line that consists of a point, called an initial point, and all points on the line that extend in one direction |

postulate | rules that are accepted without proof; also called axioms |

length of a segment | the distance between the end points of a segment |

congruent segments | segments that have the same length |

measure of an angle | consider a point A on one side of line OB. The rays of the from O,A can be matched one to one with the real numbers from 0 to 180. The measure of the angle AOB is equal to the absolute value of the difference between the real numbers for ray OA and ray OB |

acute angle | an angle with measure between 0 and 90 degrees |

right angle | angle with measure equal to 90 degrees |

obtuse angle | an angle with measure between 90 and 180 degrees |

straight angle | an angle wih measure equal to 180 degrees |

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

angle bisector | a ray that divides an angle in two adjacent angles that are congruent |

vertical angles | two angles whose sides form two pairs of opposite ray |

complementary angles | two angles whose measures have the sum 90 degrees |

supplementary angles | two angles whose measures have the sum 180 degrees |

congruent angles | angles that have the same measurement |

Created by:
softball1