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1  | 如圖甲乙丙句股形 以股為半徑截弦於丁丁丙為股弦較與丙戊等乙戊為弦和較作己戊方 甲己為句弦較庚己為其倍自庚作直線切辛角而至丙 即弦和較為股弦較二句弦較之中率故必切辛角 成大小二同式形故庚己 小股 即二句弦較與庚 己辛小句股和 即弦較和之比 若庚乙大股 即弦較和與庚 乙丙大句股和 即股弦和之比 |
| 2 | 弦較邊句即股 弦和大差句即弦較和股弦和乘倍句弦較等於弦較和自乘試作圖明其 理 |
| 3 | 汪鳳藻 |
URN: ctp:ws367516
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