1 | point | | _____ | two angles in the same plane that have the same vertex and a common side but do not have any interior points in common |

2 | line | | _____ | lines that meet to form right angles |

3 | ray | | _____ | the numbers on a protractor used to measure angles |

4 | line segment | | _____ | points not on the same line |

5 | plane | | _____ | if three sides of one triangle are congruent to three sides of another triangle, then the two triangles are congruent |

6 | postulates | | _____ | points on the same plane |

7 | noncollinear points | | _____ | a line that intersects two or more other lines, each at a different point. |

8 | coplanar points | | _____ | an angle that measures between 180 and 360 degrees |

9 | theorems | | _____ | an angle that measures 360 degrees |

10 | straight angle | | _____ | statements that can be proved |

11 | acute angle | | _____ | in a right triangle, the sum of the squares of the lengths of the legs is equal to the square of the length of the hypotenuse |

12 | obtuse angle | | _____ | angles that are interior angles on opposite sides of the transversal |

13 | transversal | | _____ | statements accepted without proof |

14 | perpendicular | | _____ | a triangle that has 3 sides all of different lengths |

15 | parallel | | _____ | if point B is in the interior of angle AOC then the measure of angle AOB + the measure of angle BOC is equal to the measure of angle AOC |

16 | alternate interior angles | | _____ | the two congruent sides of an isosceles triangle |

17 | same side interior angles | | _____ | lines that are equal distance from each other and will never meet |

18 | corresponding angles | | _____ | a tool used to measure angles |

19 | supplementary angles | | _____ | if the square of the length of the longest side of a triangle is equal to the sum of the squares of the lengths of the two shorter sides, then the triangle is a right triangle |

20 | complementary angles | | _____ | angles that are in the same position on the same side of a transversal. If you cut one out and layed it on top of the other they would match |

21 | protractor | | _____ | a part of a line with one endpoint. It has an infinite number of points on it. |

22 | scales | | _____ | 2 angles whose measurements together add up to 180 degrees |

23 | adjacent angles | | _____ | in a right triangle, the side opposite the right angle |

24 | angle addition postulate | | _____ | angle that measures between 90 and 180 degrees |

25 | complete angle | | _____ | interior angles on the same side of the transversal |

26 | reflex angle | | _____ | a triangle that has 3 sides all of which are the same length |

27 | zero angle | | _____ | angle that measures between 0 and 90 degrees |

28 | isosceles triangle | | _____ | part of a line with two endpoints. It has an infinite number of points on it. |

29 | scalene triangle | | _____ | a triangle that has 2 sides with the same length |

30 | equilateral triangle | | _____ | has no size and no dimensions; indicates a definite location |

31 | equiangular triangle | | _____ | an angle that has a measurement of 0 degrees |

32 | legs | | _____ | measures 180 degrees |

33 | acute triangle | | _____ | a triangle with 3 acute angles |

34 | obtuse triangle | | _____ | a triangle that has 3 angles all of which are the same measurement |

35 | side-side-side postulate | | _____ | a triangle with one obtuse angle |

36 | side-angle-side postulate | | _____ | if two angles and the included side of one triangle are congruent to corresponding parts of another triangle, the triangles are congruent |

37 | angle-side-angle postulate | | _____ | a flat surface that has no thickness or boundaries |

38 | hypotenuse | | _____ | if two sides and the included angle of one triangle are congruent to the corresponding parts of another triangle, then the triangles are congruent |

39 | pythagorean theorem | | _____ | straight, but it has no thickness. It is an infinite set of points that extends in both directions. |

40 | converse of the Pythagorean theorem | | _____ | 2 angles whose measurements together add up to 90 degrees |