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# Trignomotry

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

Radians | A unit of angle, equal to an angle at the center of a circle whose arc is equal in length to the radius. |

Degrees | A unit of measurement of angles, one three-hundred-and-sixtieth of the circumference of a circle: "set at an angle of 45 degrees". |

Coterminal Angle | Two angles are coterminal if they are drawn in the standard position and both have their terminal sides in the same location. |

Quadrantal angle | An angle with terminal side on the x-axis or y-axis. That is, the angles 0°, 90°, 180°, 270°, 360°, 450°, ... as well as –90°, –180°, –270°, –360°, ... |

Unit Cicle | The circle with radius 1 which is centered at the origin on the x-y plane. |

Reference angle | Is an acute version of that angle |

Sine | Written sin θ, Opposite/hypontenuse |

Cosine | For acute angles, cos θ, Adjacent/hypotenuse |

Tangent | tan θ equals Sinθ/Cosθ |

Cosecant | The ratio of the hypotenuse (in a right-angled triangle) to the side opposite an acute angle; the reciprocal of sine |

Secant | The ratio of the hypotenuse to the shorter side adjacent to an acute angle (in a right-angled triangle); the reciprocal of a cosine. |

Cotangent | The ratio of the side (other than the hypotenuse) adjacent to a particular acute angle to the side opposite. |

Inverse | The quantity which cancels out the a given quantity |

Arcsin | The inverse function of the sine; the angle that has a sine equal to a given number. |

Arccos | The inverse function of the cosine; the angle that has a cosine equal to a given number. |

Arctan | The inverse function of the tangent; the angle that has a tangent equal to a given number. |

Law of Sines | Equations relating the sines of the interior angles of a triangle and the corresponding opposite sides. |

Law of Cosines | An equation relating the cosine of an interior angle and the lengths of the sides of a triangle. |

Created by:
alvarezm1480