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# Geometry Vocab.

### Use to study geometry vocabulary.

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

Point | Names an exact location in space. |

Line | Continues without end in both directions. |

Ray | Part of a line that has an endpoint and goes on forever in the other direction . |

Line Segment | Has two endpoints. |

Intersecting Lines | Lines that intersect at exactly one point and form 4 angles. |

Perpendicular Lines | Lines that intersect to form 4 right angles. |

Parallel Lines | Lines that never intersect and are always the same distance apart. |

Angle | Two rays with same endpoint. |

Vertex | The endpoint where two rays meet for form an angle. |

Right Angle | An angle that measure exactly 90 degrees. |

Obtuse Angle | An angle that measures more than 90 degrees but less than 180 degrees. |

Acute Angle | An angle that measures less than 90 degrees but more than 0 degrees. |

Straight Angle | An angle that measures exactly 180 degrees. |

Acute Triangle | A triangle with three acute angles. |

Right Triangle | A triangle with exactly 1 right angle and 2 acute angles. |

Obtuse Triangle | A triangle with exactly 1 obtuse angle and 2 acute angles. |

Triangle | A closed figure with 3 sides and 3 angles. |

Quadrilateral | A closed figure with 4 sides and 4 angles. |

Rectangle | A four sided figure with 2 sets of parallel sides, opposite sides are equal, and 4 right angles. |

Square | A four sided figure with 2 sets of parallel sides, 4 equal sides, and 4 right angles. |

Trapezoid | A four sided figure with 1 set of parallel sides. |

Rhombus | A four sided figure with 2 sets of parallel sides and 4 equal sides. |

Parallelogram | A four sided figure with 2 sets of parallel sides and opposite sides are equal. |

Symmetry | When a figure is folded along a line so that the two parts match exactly. |

Protractor | A math instrument used to measure angles. |

Polygon | A closed figure with straight sides. |

Regular Polygon | a polygon with all sides equal in length and all angles equal in measure. |