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1  | 有圓城甲出北 門東行二百步而立乙出南門直行回望見甲與城參相直複斜行至甲處 其行五百六十步求城徑若干 |
| 2 | 廷俊 |
| 3 | 答曰二百四 十步 |
| 4 | 立天元一為半徑倍 之即大弦和較甲行之路等於底句乙共行之路等於底弦明股和底句內 減天元得甲［元］為 大股弦較二底弦明股和內減二底句得 為二明三事和即二大句弦較以 乘大股弦較得 寄左另以大弦和較自之得元 為同數與左相消得二 開 方得半徑倍之即全徑 |
URN: ctp:ws700205
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