Nine Chapters on the Mathematical Art, Volume 1

Commentary by Liu Hui of the Wei Dynasty

Commentary and annotations compiled by imperial decree by the Court Astronomer and official Li Chunfeng and others of the Tang Dynasty.

Field Measurement To manage the boundaries of agricultural fields.

Now, there is a field with a width of 15 bu paces and a length of 16 bu. How much is the field?

Answer: 1 mu a unit of land area.

There is another field with a width of 12 bu and a length of 14 bu. How much is the field?

168 bu Diagram: length 14, width 12