Across |

1. | The opposite angles formed by two intersectingg lines |

5. | The mean or average of a set of data measured on a logarithmic scale |

6. | A segment from a vertex to the midpoint of the opposite side in a triangle |

9. | A point where the edges of a figure intersect |

13. | collection of points along a straight path |

14. | has one endpoint and extends in the other direction |

15. | a triangle with one right angle |

16. | A triangle with three acute angles |

18. | A plane figure with at least three straight sides and angles and typically five or more. |

19. | A shape that results from a transformation of a figure known as the preimage |

20. | A quadrilateral with four congruent sides and four right angles |

21. | a quadrilateral with 2 pairs of parallel sides |