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# Howard Geometry 9

### Chapter 9 Geometry Vocabulary

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

Prism | A polyhedron with two, congruent faces that lie in parallel planes. |

Cylinder | A solid with two, congruent circular bases that lie in parallel planes. |

Pyramid | A polyhedron with one base and triangular lateral sides that meet at a common vertex. |

Cone | A solid with a circular base and a vertex that is not in the same plane as the base. |

Sphere | The set of all points in a plane equidistant from a given plane |

Surface Area | The sum of the areas of all of the faces of a solid |

Volume | The number of cubic unit s contained in the interior of a solid figure |

Net | A two dimensional representation of a three dimensional object |

Cubic Units | The units always used in volume |

Square Units | The unit always used for surface area |

Parallel | The bases of a prism are always polygonal, congruent and ______________? |

Solid | A three-dimensional object |

Polyhedron | A special solid figure formed by polygons |

Bases | Polyhedrons are named by the shape of these |

Lateral Area | The surface area of a polyhedron that does NOT include the area of the bases |

Vertex | The point where two edges meet |

Edge | The point where two faces meet |

Faces | The flat, polygonal surfaces of a polyhedron |

Slant Height | The perpendicular distance from the edge of base of a pyramid or cone to the vertex |

Height of a Prism | The distance between the two, polygon bases |

Height of a Cylinder | The distance between the two, circular bases |

Height of a Cone | The distance between the vertex and the center of the circular base |

Height of a Pyramid | The distance between the top vertex and the center of the polygonal base |

Radius | The segment formed by connecting the center of a circle to any point on the circle |

Diameter | The segment formed by connecting any two points on a circle that passes though the center |