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1. | Two angles that add up to 90 degrees (2 Words) |

2. | Endpoints of a line that pass halfway through the center of a circle |

3. | Two angles in the sme plane who share a common side and vertex (2 Words) |

5. | Angle at 180 degrees (2 Words) |

7. | common endpoint formed when two rays meet |

8. | Any point between or inside of an angle (4 Words) |

9. | Endpoints of a line that pass completely through the center of a circle |

10. | The side lengths of a figure |

12. | Anlge greater than 90 degrees; smaller then 180 degrees (2 Words) |

14. | Angle smaller that 90 degrees (2 Words) |

18. | Number of nonpverlapping square units in a figure |