# Geometry 1st 9 weeks

Term | Definition |
---|---|

Line | straight path moving in both direction without end |

Intersecting lines | lines that cross |

Parallel lines | lines that do not meet |

Angle | two rays with the same endpoint |

Open figure | figure whose end do not meet |

Closed figure | figure whose ends meet |

Polygon | closed figure made up of line segments |

Point | any exact location |

Line segment | part of a line with two end points |

Ray | a line with one end point and extending forever in the other direction |

Plane | flat surface that extend forever |

Quidrilateral | a 4 sided figure |

Pentagon | a polygon with 5 sides |

Hexagon | polygon with 6 sides |

Octagon | figure with 8 sides |

Decagon | figure with 10 sides |

Acute angle | angles less that 90 degrees |

Right angle | a 90 degree angle that makes a corner |

Obtuse angle | an angle greater than 90 degrees |

Straight angle | 180 degree angle that makes a straight line |

Reflex angle | an angle greater than a straight angle |

Whole angle | 360 degree angle that makes complete circle |

triangle | a figure with three angles |

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