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1  | 如图甲乙丙句股形 以股为半径截弦于丁丁丙为股弦较与丙戊等乙戊为弦和较作己戊方 甲己为句弦较庚己为其倍自庚作直线切辛角而至丙 即弦和较为股弦较二句弦较之中率故必切辛角 成大小二同式形故庚己 小股 即二句弦较与庚 己辛小句股和 即弦较和之比 若庚乙大股 即弦较和与庚 乙丙大句股和 即股弦和之比 |
| 2 | 弦较边句即股 弦和大差句即弦较和股弦和乘倍句弦较等于弦较和自乘试作图明其 理 |
| 3 | 汪凤藻 |
URN: ctp:ws367516
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