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Mathematics -> Hai Dao Suan Jing -> 6.1 - Parallel passages[More information]
今有東南望波口,立兩表南、北相去九丈,以索薄地連之。當北表之西卻行去表六丈,薄地遙望波口南岸,入索北端四丈二寸。以望北岸,入前所望表里一丈二尺。又卻後行1去表一十三丈五尺。薄地遙望波口南岸,與南表參合。問波口廣幾何?
1. 後行 : Originally read: "行後". Corrected by 李淳風注。