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1. | A triangle with three acute angles |

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

3. | A triangle in which all three sides are congruent |

4. | A quadrilateral with one and only one pair of parallel sides |

6. | A polygon in which all sides are congruent |

7. | The point where the three medians of a triangle intersect |

8. | A point at an end of a segment or a starting point of a ray |

9. | Lying in the same plane |

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

14. | A statement that is believed to be true |

15. | A statement using "if and only if" |

16. | A ray that divides an angle into two congruent angles |

19. | An angle whose measure is less than 90 degrees |

20. | Lying on the same line |

22. | A line, ray, or segment that intersects two or more coplaner lines, rays, or segments, each at a different point |

23. | A statement that is accepted as true without proof |

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

26. | A statement that has been proven to be true deductively |

27. | Abbreviation for "corresponding parts of congruent triangles are congruent" |