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# Geometry

### Vocabulary

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

A triangle with three sides of equal length, and three angles of equal measures | equilateral triangle |

A triangle in which two sides are of equal length, and two angles have the same measure | isosceles triangle |

A triangle in which all three sides have different lengths, and all three angles have different measures | scalene triangle |

A triangle with one angle measuring 90 degrees | right triangle |

congruent | having exactly the same size and shape |

polygon | a closed figure, made up of sides that do not overlap |

regular polygon | a polygon in which all sides are the same length, and all angles have the same measure |

parallel | lines that are always the same distance apart, and never intersect |

perpendicular | lines that intersect to form four right angles |

quadrilateral | a four sided polygon |

pentagon | a five sided polygon |

hexagon | a six sided polygon |

octagon | an eight sided polygon |

acute angle | an angle measuring less than 90 degrees |

obtuse angle | an angle measuring greater than 90 degrees, but less than 180 degrees |

right angle | an angle measuring exactly 90 degrees |

reflex angle | an angle measuring more than 180 degrees |

parallelogram | a quadrilateral with two pairs of parallel sides |

trapezoid | a quadrilateral with one pair of parallel sides |

vertex | point where two lines meet to form an angle |

Created by:
MrArchung