Liu, Hui, active 3rd century-4th century creator text utu 2008 monographic zh 1 online resource : multiple file formats "海島算經" by Liu Hui is a mathematical manual written during the Three Kingdoms era (220–280). Originally an extension of "The Nine Chapters on the Mathematical Art," it became a separate work during the Tang dynasty and was included in imperial mathematics examinations. The text presents practical surveying problems, demonstrating how to measure inaccessible distances and heights using poles and geometric principles. Nine problems cover scenarios like determining island heights, mountain elevations, and city dimensions through ingenious indirect measurement techniques. (This is an automatically generated summary.) Wikipedia page about this book: https://en.wikipedia.org/wiki/Haidao_Suanjing Release date is 2008-10-20 Produced by Yvonne Original publication data not identified Arithmetic -- Early works to 1900 AC QA Original publication data not identified https://www.gutenberg.org/ebooks/26979 https://www.gutenberg.org/ebooks/26979 UtSlPG 260607 20260610133621.0 26979