Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size Small Size show me how

Normal Size Small Size show me how

# Unit 2 vocabulary

### vocabulary 15

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

acute angles | less than 90 degrees |

point | has no length width or thickness but has a position has location |

space | is the boundless 3-dimensional set of all points. |

Line | has a length, but no width or thickness. it extends without end in two directions |

Coplanar | points and lines in the same plane |

intersecting Lines | lines share a point |

intersecting planes | sahre an indefinite number of points when tow palnes intersect, the intersection is a line |

Postulate | A statement accepted to be true without proof |

postulate 1-1 | through any two points there is exactly one line |

postulate 1-2 | If two line intersect then they intersect in excatly one point. |

Postulate 1-3 | If two planes then they intersect in exactly one line |

postulate 1-4 | through any three noncollinear points there is excatly one plane. |

Line segment | is a portion or a line between two points, called endpoints |

Ray | is a part of a line that consits of an inital point and all points on the line that lie on ine side of the inital point |

opposite rays | start at the same point and go in opposite directions |

Parallel Lines | are coplanar lines that do not intersect |

Skew Lines | are noncoplanar lines therefore they are not parallel and do not intersect |

Perpendicular Lines | Lines intersect to form right angles. |

Parallel planes | are planes that do not intersect |

Ruler postulate | The distance between any two points on a number line is the absolute value of the difference of the corresponding numbers. |

Congruent Segments | Two segments with the same length. |

Midpoint of a Segment | a point that divides a segment into two congruent segments. It bisects the segment |

Bisector of a segment | any line, ray or other segment through a midpoint |

angle | two rays that are concted at their endpoints |

Protractor | Device used to measure angles |

Obtuse Angle | more than 90 degrees |

Right angle | Excaty 90 degrees |

Congruent angles | With the same measures |

Angle Bisector | ray that divides an angle into two congruent (=)angles |

conjecture | is a conclusion reached by using inductive reasoning |

Inductive reasoning | is a type reasonings that reaches conclusions based on a pattern of specific examples or past events |

counterExample | is an example that proves a conjecture is false |

Created by:
niya19