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1. | If a plane intersects two ______________, then the intersection |

3. | Two of these that intersect determine a plane |

4. | If________ planes are perpendicular to each other, then one plane contains a line perpendicular to the second plane. |

5. | Lines in the same plane that do not interesct |

7. | The ___________ of a triangle is a segment from a vertex to the midpoint of the opposite side |

8. | The locus of all points (in 3-dimensional space) whose distance from C is equal to r |

10. | The medians of a triangle intersect at a point that is __________of the distance from each vertex to the midpoint of the opposite side. |

12. | Lines are two or more lines that intersect in one point |

13. | Located at intersection of the medians |

16. | Two lines perpendicular to the same plane are |

17. | Located at intersection of the perpendicular bisectors of the sides |

20. | is a surface, consisting of points on the lines (generators) drawn through the points on a fixed curve and parallel to a fixed line, the generators being extended indefinitely in both directions. |

21. | The________of a dihedral angles is equal to the measure of the plane angle formed by two rayseach in a different half plane of the angle and each perpendicular to the common edge at the same point of the edge |

24. | A polyhedron possessing two congruent polygonal faces and |

26. | The type of angle formed by 2 rays in the samae plane |