Term | Definition |

sine | opposite/hypotenuse |

cosine | adjacent/hypotenuse |

tangent | opposite/adjacent |

compass bearing | a direction given stating the angle either side of north or south, such as S60°E |

true bearing | a direction given by measuring the angle clockwise from north such as 120°T |

radial survey | a radial survey involves measuring the angles between radial lines drawn from a central point in the direction of the corners of the land, and Measuring the lengths of the radial lines, |

angle of elevation | the angle of elevation is the angle measured upwards from the horizontal |

angle of depression | the angle of depression is the angle measured downwards from the horizontal |

one degree | equals 60 minutes |

one minute | equals 60 seconds |

hypotenuse | the side opposite the right angle |

area of a triangle | half the product of the two sides multiplied by the sine of the angle between the two sides |

sine rule | used in a non right angled triangle given two sides and an angle opposite one of the given sides or two angles and one side |

cosine rule | used where three sides and one angle are involved |