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# Math Vocab Unit 1

### Geometry vocab

Question | Answer |
---|---|

point | has no size, all geometric figures are made. |

Line | series of points that extends in opposite directions without end. |

Plane | a flat surface with no thickness |

Space | the set of all points |

Rays | part of a line with one endpoint |

Segment | part of a line with two end points |

Opposite Rays | two collinear rays with a common endpoint |

Acute angle | angle less than 90' |

Obtuse angle | angle more than 90' |

Straight Angle | angle 180' |

Collinear | points on the same line |

coplanar | points and lines in the same plane. 3 |

Deductive reasoning | use facts, definitions, rules or properties to reach a conclusion |

conjecture | a conclusion reached using inductive reasoning |

parallel lines | coplanar lines that never intersect |

skew lines | non-planar lines that never intersect |

angle | formed by two rays with same endpoint |

right angle | equals 90' |

vertical angles | non adjacent angled formed by two intersecting lines |

linear pair | angles are adjacent whose non common sides are opposite rays |

adjacent angles | angles in the same plane that have a common vertex and a common side, but no common interior points |

supplementary angles | two angles of the sum of the degrees = 180' |

complementay angles | two angles sum = 90' |

theorem | a statement that must be proven before it is accepted as true |

corollary | an inference, follows little to no proof |

postulate | true statement, which doesn't need to be proven |

counterexample | makes a conjecture false |

segment addition postulate | AB+BC=AC |

angle addition postulate | m |

congruent angles | have the same degree measure |

congruent segements | have the same length |

Pythagorean Theorem | c"=a"+b" |

perpendicular lines | form 4 right angles |

distnace formula | d= (x"-x')" + (y"-y')" |

midpoint | a+b/2 |

midpoint formula | x'+x"/2 , y'+y"/2 |

angle bisector | a ray that divides an angle into two congruent angles |

hypotenuse | c |

legs of a right triangle | a and b |

perpendicular bisector | line in perpendicular |

inductive reasoning | educated guess |

Created by:
hammy57