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# geometry vocabulary

### morgan's geometry vocabulary & things

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

point | an exact location on a plane surface |

line | goes on forever in both directions, 180 degrees |

line segment | a section of a line with two end points |

ray | goes on forever in one direction, has one end point |

parallel lines | lines that are the same distance apart and they will never intersect |

perpendicular lines | 2 lines that intersect and form 4 right angles |

angles | geometric shapes that are formed wherever 2 rays share a common end point |

right angle | exactly 90 degrees |

acute angle | smaller than a right angle |

obtuse angle | larger than a right angle, smaller than a line |

strait angle | exactly 180 degrees |

congruent | figures that have the same shape and size, all sides and angles are equal |

polygon | a closed figure made of line segments |

quadrilateral | four sided polygon, includes : rectangle, square, rhombus, parallelogram, and trapezoid |

rhombus | a parallelogram with four equal sides |

square | a parallelogram with four equal sides and four right angles |

rectangle | 4 sides, 4 right angles, opposite sides are equal and parallel |

trapezoid | 4 sided figure, exactly one pair of parallel lines |

pentagon | 5 sided polygon |

hexagon | 6 sided polygon |

heptagon | 7 sided polygon |

octagon | 8 sided polygon |

decagon | 10 sided polygon |

line of symmetry | a line that divides a figure into 2 mirror images |

vertex or vertices | a point were line segments meet, it is called vertices when there are more than one point |

right triangle | a right triangle has exactly one right angle |

acute triangle | acute triangles have 3 acute angles |

obtuse triangle | an obtuse triangle has exactly one obtuse angle |