1 | acute angle | | _____ | two angles that sum to 90º |

2 | adjacent angles | | _____ | a closed figure made up of segments |

3 | bisector | | _____ | the endpoint of 2 rays that form an angle |

4 | circumference | | _____ | an angle that measures 180º exactly |

5 | collinear points | | _____ | points or lines that lie on the same plane |

6 | complementary angles | | _____ | a 2 dimensional figure that is straight & continuous in 2 directions |

7 | congruent | | _____ | a pair of adjacent angles that form a line |

8 | conjecture | | _____ | a line that cuts a segment or angle into two equal pieces |

9 | coplanar | | _____ | a piece of a line that has 2 endpoints |

10 | intersection | | _____ | a piece of a line that is continuous in one direction |

11 | line | | _____ | an angle that measures more than 90º but less than 180º |

12 | linear pair | | _____ | an educated guess based on patterns or examples |

13 | midpoint | | _____ | the figure that represents location |

14 | obtuse | | _____ | a point (or line) where 2 or more lines (planes) meet |

15 | opposite rays | | _____ | points on the same line |

16 | plane | | _____ | the distance around a polygon |

17 | ray | | _____ | angles or segments that have the same measurement |

18 | right | | _____ | an angle that measures less than 90º |

19 | segment | | _____ | two angles that sum to 180º |

20 | straight | | _____ | angles that are next door neighbors |

21 | supplementary | | _____ | two collinear rays that share a common endpoint and travel in opposite directions |

22 | vertical | | _____ | a 2-dimensional diagram that you can fold to form a 3-d figure |

23 | point | | _____ | a point that divides a segment into two equal segments |

24 | coordinate | | _____ | two angles that are not adjacent, always congruent, and formed by two intersecting lines |

25 | perimeter | | _____ | an angle that measures 90º exactly |

26 | net | | _____ | distance around a circle |

27 | polygon | | _____ | numbers that correspond to a point on a number line or graph |

28 | vertex | | _____ | a flat surface that is continuous in each direction |