colplanerpoints | | vertical angles are ____________. |

segmentbisector | | a statement formed by writing the negative of the original statement. |

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

segment | | a conditional statement that is formed by swithing the hypothesis and the conclusion. |

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

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

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

conditionalstatement | | a=a; ___________ property. |

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

perpendicular | | the "then" part of a conditional statement. |

counterexample | | a true statement that follows as a result of othertrue statements. IT MUST BE PROVEN. |

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

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

intersection | | rules that had to be proven. |

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

congruent | | if the sum of two angles is 180, then they are _____________. |

symmetric | | point, line, plane are all ___________ terms. |

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

linearpair | | angle that measures exactly 180 degrees. (two words) |

noncollinearpoints | | two adjacent angles whose non-common sides are opposite rays. (two words) |

inductivereasoning | | angle that measeures 89 degrees or less. (two words) |

parallel | | two planes that do not intersect. |

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

hypothesis | | an example that shows a conjecture is false. |

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

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

adjacentangles | | angle that measures exactly 90 degrees. (two words) |

straightangle | | points that do not lie on the same line. (two words) |

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

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

complementary | | part of a line that consists of an initial point and all points to one side of thgat point. |

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

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

conjecture | | a line that intersects two or more coplaner lines at different points. |

noncoplanerpoints | | if two lines are coplaner and do not intersect, then they are _____________. |

deductivereasoning | | a logical statements with two parts. (two words) |

theorems | | consists of two different rays that have the same initial point. |

rightangle | | part of a line that conists of two endpoints and all of the points in between. |

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

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

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

angle | | two collinear rays that have the same initial point, but extend in opposite directions. (two words) |

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

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

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

transitive | | lines that do not intersect and are not coplaner are __________. |