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1. | a=a; ___________ property. |

3. | if a=b and b=c, then a=c; ____________ property. |

4. | if a=b, then b=a; ____________ property. |

6. | the set of points that figures have in common. |

7. | rules that are accepted without proof. "duh" |

8. | the "if" part of a conditional statement. |

11. | points that do not lie on the same plane. (two words) |

12. | if two lines intersect to form a right angle, then they are ___________. |

13. | two angles that share a common vertex, a common side, and no common interior points. (two words) |

15. | points that lie on the same plane. (two words) |

16. | a statment that coontains the phrase "if and only if" and is equivalent to writing a conditional statement and its converse. (two words) |

17. | using facts, definitions, and accepted properties in a logical order to write a logical argument. (two words) |

19. | points that lie on the same line. (two points) |

20. | if the sum of two angles is 90, than they are |

21. | segments that have the same length. (two words) |

22. | a process that involves looking for patterns and making conjectures. (two words) |

23. | vertical angles are ____________. |

24. | a segment, ray, line, or plane that divides a segmentat its midpoint. (two words) |

27. | a conditional statement that is formed by switching and negating th hypothesis and the conclusion. |

28. | an unproven statement that is based om observations. |

30. | a ray that divides an angle into two adjacent angles that are congruent. (two words) |

32. | a point that divides a segment into two congruent segments. |

33. | angle that measures from 91 degrees to 179 degrees. (two words) |

38. | abbreviation for "if and only if". |