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# Math Vocab

### 1.5 pages 37-46

Term | Definition |
---|---|

Angle (how to name it): | Angle sign, and then the letter at the point where the 2 rays connect |

Vertex of an angle: | The common endpoint of 2 rays |

Side of an angle (be careful in the labeling): | The rays of an angle |

Interior vs exterior of an angle: | Interior is the inside of the angle/triangle. Exterior is the outside of the angle/triangle |

Postulate 1.3 The Protractor Postulate: | The measure of ∠AOB, which can be written as m∠ZAOB, is equal to the absolute value of the difference between the real numbers matched with OA and OB on a protractor. |

Postulate 1.4 The Angle Addition Postulate: | Words: If P is in the interior of∠RST, then the measure of ∠RST is equal to the sum of the measures of ∠RSP and ∠PST. Symbols: If P is in the interior of ∠RST,then, m∠RST = m∠RSP+m∠PST |

Measure of an angle (degrees): | The absolute value of the difference between the real numbers matched with the 2 rays that form the angle on a protractor |

Construction - Bisecting an angle (use a ruler and compass): | A geometric drawing that uses a limited set of tools, usually a compass and a straightedge |

Types of angles: | There are three types of angles, acute, obtuse, and right |

Acute angle: | An angle that has a measure greater than 0° and less than 90° |

Obtuse angle: | An angle that has a measure greater than 90° and less than 180° |

Right angle: | An angle that has a measure of 90° |

Straight angle: | An angle that has a measure of 180° |

Congruent angles: | 2 angles that have the same measure |

Angle bisector: | A ray that divides an angle into 2 angles that are congruent |