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# Geometry Vocab

### Use these flash cards to help you remember important geometric vocabulary terms!

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

isosceles triangle | A triangle with at least two side lengths and angle measures that are equal. |

adjacent angles | two angles that share a vertex and side. |

opposite angles | angles that are "opposite" each other. These types of angles are congruent. |

scalene triangle | a triangle with no sides or angles of equal measure. |

obtuse triangle | a triangle with one obtuse angle. |

right triangle | a triangle with one right angle. |

exterior angle | an angle on the outside of a polygon after you extend one of its sides. |

interior angle | an angle on the inside of a polygon. |

reflex angle | an angle whose measure is greater than 180 degrees and less than 360 degrees. |

rectangle | a parallelogram with all right angles |

rhombus | a parallelogram with all equal side lengths |

parallelogram | opposite side lengths are parallel; opposite angles and sides are congruent. |

rotation symmetry | a shape has this symmetry if it can be rotated less than a full turn and it looks exactly as it did before it was rotated. |

reflection symmetry | a shape with reflection symmetry has two halves that are mirror images of each other after drawing a line of symmetry through it. |

angle sum | the sum of all the measures of the interior angles of a polygon. |

(n-2) X 180 degrees | formula to find the interior angle sum of a poylgon. |

(n X 180 degrees) - 360 degrees | formula to find the interior angle sum of a polygon. |

360 degrees | the exterior angle sum of any polygon, irregular or regular. Also is the interior angle sum of any quadrilateral. |

regular polygon | a polygon whose side lengths are congruent, and whose interior and exterior angles are all congruent. |

How to build a triangle | The sum of the two smaller sides must be greater than the third (longest) side. |

How to build a quadrilateral | The sum of the three smaller sides must be greater than the fourth (longest) side. |

180 degrees | Sum of angles that create a straight angle, or the interior angle sum of a triangle. |

acute triangle | triangle with all acute angles |

equilateral triangle | triangle with all side lengths and angle measures being congruent |

Created by:
emains