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# Geometry Vocab Cards

### 4th Grade vocab cards

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

Concave Polygon | 1 or more angle(s) point inward (caves in). |

Polygons | A closed figure made of line segments that do not overlap. |

Point | Location in space. |

Line | Points connected in a straight path that goes on forever in both directions. |

Congruent | Same or equal measure. |

Regular Polygon | Has all congruent sides and angles. |

Convex Polygon | All angles point outward. |

Line Segment | Part of a line with two endpoints. |

Acute Angle | Less than 90 degrees. |

Octagon | Eight sided polygon. |

Triangle | Three sided polygon. |

Parallel Lines | Lines that never intersect. |

Quadrangle | Four sided polygon. |

Vertex | The shared endpoint in an angle. |

Undecagon | Eleven sided polygon. |

Right Angle | 90 degrees. |

Heptagon | Seven sided polygon. |

Decagon | Ten sided polygon. |

Perpendicular Lines | Lines that intersect to form a right angle. |

Obtuse angle | Between 90 and 180 degrees. |

Hexagon | Six sided polygon. |

Intersecting lines | Lines that cross. |

Dodecagon | Twelve sided polygon. |

Ray | Part of a line with only 1 endpoint. |

Nonagon | Nine sided polygon |

Straight Angle | 180 degrees. |

Pentagon | Five sided polygon. |

Angle | 2 rays that share an endpoint. |

Acute Triangle | All three angles are less than 90 degrees. |

Right Triangle | One 90 degree angle. |

Obtuse Triangle | One angle greater than 90 degrees. |

Scalene Triangle | No congruent sides. |

Isosceles Triangle | At least two congruent sides. |

Equilateral Triangle | Three congruent sides. |

Parallelgram | A quadrangle with 2 pairs of parallel sides. |

Rectangle | A parallelogram with 4 right angles. |

Rhombus | a parallelogram with 4 congruent sides. |

Square | A parallelogram with 4 right angles and 4 congruent sides. |

Trapezoid | A quadrangle with only 1 set of parallel sides. |

Kite | A quadrangle with no parallel sides 2 sets of congruent sides that are adjacent. |

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