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# Geometry Vocabulary

### Vocabulary for Unit 5: Geometry (Grade 6)

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

Area | The size of a flat surface calculated by measuring the length and width. |

Parallelogram | A quadrilateral with opposite sides parallel and opposite sides congruent. |

Quadrilateral | A closed figure having four sides and four angles. |

Triangle | A figure with three sides and three angles. |

Trapezoid | A quadrilateral with one pair of parallel lines. |

Parallel | Lines in a plan that never intersect. |

Composite Figure | A figure made of triangles, quadrilaterals, semicircles, and other two-dimensional figures. |

Face | A flat surface. |

Edge | The outer or furthest point of something. |

Vertex | The point where three or more faces intersect. |

Volume | The amount of space inside a three-dimensional figure. Volume is measured in cubic units. V + lwh |

Surface Area | The sum of the area of all the surfaces (faces) of a three-dimensional figure. SA= 2lh + 2lw + 2hw |

Net | A two-dimensional figure that can be used to build a three-dimensional figure. |

Polygon | A simple closed figure formed by three or more straight line segments. |

Coordinate Plane | A plane in which a horizontal number line and a vertical number line intersect at their zero points. |

Ordered Pair | A pair of numbers used to locate a point on the coordinate plane. The ordered pair is written in the form (x,y) |