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# Geometry Chapter 12

### Geometry Chapter 12 Vocabulary

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

a solid that is bounded by polygons, called faces, that enclose a single region of space | polyhedron |

a point where three or more edges of a polyhedron meet | vertex |

a line segment formed by the intersection of 2 faces of a polyhedron | edge |

five regular polyhedra, named after the greek mathematician and philospher plato | platonic solids |

the intersection of a plane and a solid | cross section |

a polyhedron with two congruent faces, called bases, that lie in parallel planes | prism |

the sum of the areas of the fences of a polyhedron or other solid | surface area |

the sum of the areas of the lateral faces of a polyhedron or other solid with 1 or 2 bases | lateral area |

the two dimensional representation of the faces of a polyhedron | net |

a prism in which each lateral edge is perpendicular to both bases | right prism |

a prism with lateral ledges that are not perpendicular to the bases | oblique prism |

a solid with congruent circular bases that lie in parallel planes | cylinder |

a cylindar in which the segment joining the centers of the bases is perpendicular to the bases | right cylinder |

a polyhedron in which the base is a polygon and the lateral faces are triangles with a common vertex called the vertex of the pyramid | pyramid |

a pyramid that has a regular polygonfor a base and in which the segment joining the vertex and the center of the base is perpendicular to the base | regular pyramid |

a solid that has 1 circular base and a vertex that is not in the same plane as the base | cone |

a cone in which the segment joining the vertex and the center of the base is perpendicular to the base | right cone |

the number of cubic units contained in the interior of a solid | volume |

the set of all pointsin space equidistant from a given point called the center of the sphere | sphere |

the intersection of a sphere and a plane that contains the center of the sphere | great circle |

half of a sphere, formed when a great circle seperates a sphere into 2 congruent halves | hemisphere |

two solids of the same type with with equal ratios of cooresponding linear measures, such asheights or radii | similar solids |

Created by:
aelohaus