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# Geo_4.3

### Vocabulary for Geometry_4.3

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

angle of depression | The angle between the line of sight and the horizontal when an observer looks downward. |

angle of elevation | The angle between the line of sight and the horizontal when an observer looks upward. |

cosine | For an acute angle of a right triangle, the ratio of the measure of the leg adjacent to the acute angle to the measure of the hypotenuse. |

sine | For an acute angle of a right triangle, the ratio of the measure of the leg opposite the acute angle to the measure of the hypotenuse. |

tangent | For an acute angle of a right triangle, the ratio of the measure of the leg opposite the acute angle to the measure of the leg adjacent to the acute angle. |

inverse cosine | The inverse function of cosine, or cos-1. If the cosine of an acute ∠A is equal to x, then cos^(-1)x is equal to the measurement of ∠A. |

inverse sine | The inverse function of sine, or sin-1. If the sine of an acute ∠A is equal to x, then sin^(-1)x is equal to the measurement of ∠A. |

inverse tangent | The inverse function of tangent, or tan-1. If the tangent of an acute ∠A is equal to x, then tan^(-1)x is equal to the measurement of ∠A. |

trigonometric ratio | A ratio of the lengths of sides of a right triangle. |

trigonometry | The study of the properties of triangles and trigonometric functions and their applications. |

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