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

# Lines and Angles

### lines and angles

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

Point | is an exact position on a plane surface |

Line | is a set of points in a straight path that extends in opposite directions without ending |

Line Segment | is a part of a line between 2 end points |

Ray | is a part of a line that has 1 end point and extends in one direction without ending |

Parallel lines | 2 lines are parallel if they never cross and remain distances apart no matter how far they are extended |

Perpendicular Lines | 2 lines are perpendicular if they are right angles (90*) to each other |

Angle | Whenever lines meet we say they intersect. The point where lines meet is called an intersection or vertex |

Acute angle | Less than 90* smaller than a right angle |

Right angle | exactly 90* |

Obtuse angle | greater than 90* but smaller than 180* bigger than a right angle |

Straight angle | exactly 180* |

Reflex angle | greater than 180* but less than 360* bigger than a right angle |

Revolution angle | full 360* |

Complementary angles | two angles are complementary when they add up to 90* a (right angle) they don't have to be next to each other, just as long as the total is 90* |

Supplementary angles | two angles are complementary when they add up to 180* they don't have to be together, just as long as they add up to 180* |

Vertically opposite angles | are the angles opposite of each other when 2 lines intersect "vertical" in this case means they share the same vertex, not the usual meaning of up-down vertically opposite angle are equal |

Angles at point | angles around a point will always add up to 360* |

Created by:
dayekayl