Used in the book

Chinese | Pinyin | Definition |

¤Ø | chi |
Length unit: 1 Chi varies from 25 to 30 cm (10 to 12 inches). During
much of the past 2000 years, it varied around 25 cm +/-. See Ref. |

¨B | bu |
Length unit: Bu is the basic unit of length used in the book
1 bu = 3 chi |

¨½ | li | Unit of length: 1 li = 300 bu |

¿n ¨B | ji bu | Unit of Area: 1 square bu = 1 bu x 1 bu |

¿n ¨½ | ji li | Area unit: 1 square li = 1 li x 1 li
= 375 mu = 90,000 bu |

¯a | mu | Area unit: 1 mu = 240 square bu |

³¼ | qing | Area unit: 1 qing = 100 mu |

¤è ¥Ð | fang tian | Rectangular field = Rectangle |

¼s | guang | width |

±q | cong | length |

¦c ¥Ð | gui tian | Triangular area |

¨¸ ¥Ð | xie tian | Trapezoidal area |

ºß ¥Ð | ji tian | Right-angle trapzoidal area |

¶ê ¥Ð | yuan tian | Circular area |

©P | yuan zhou | Circumference of circle |

®| | yuan jing | diameter of a circle |

©{ ¥Ð | wan tian | semi-circular area |

©· ¥Ð | hu tian | Area of segment |

©¶ | xian | chord |

¥Ú | shi | radius |

Àô ¥Ð | Area of ring | |

chinapage.org/math/def.html |