Across |

2. | A plane surface of a geometric solid |

5. | An instrument for drawing or describing circles |

9. | A surface or solid bounded by two parallel planes |

10. | An equilateral parallelogram, including the square as a special case |

12. | A quadrilateral plane figure having two parallel and two nonparallel sides |

14. | The branch of mathematics that deals with the deduction of the properties, measurement, and relationships of points, lines, angles, and figures in space from their defining conditions by means of certain assumed properties of space |

16. | Two rays with a common end point form an angle |

17. | A line in which falls on the other in such a way as to create congruent adjacent angles |

18. | A quadrilateral with two pairs of parallel sides |

19. | a continuous extent of length, straight or curved, without breadth or thickness; the trace of a moving point |

20. | A triangle that has one right angle |

23. | 180 degrees |

24. | A polygon having five sides |

25. | A polygon having eight sides |

26. | 360 degrees |

27. | A closed plane figure having three sides and three angles |

28. | the point farthest from the base |

29. | A rotation or translation of a plane figure that leaves the figure unchanged although its position may be altered |