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1  | 如圖甲乙丙大句股 乙丁容圓方自心至切點作戊己線正交甲丙則辛己戊為高句股戊己庚 為平句股 以半徑為勾半徑為股故 己癸等癸寅己子等子丑 則辛己高股為明句弦和己庚平句即為股弦和故明句弦和 高股與句弦 和比若明股弦和與股弦和 平句比 |
| 2 | 大差句乘小差 句等於虛句乘大股亦等於邊股乘倍股試作圖解 |
| 3 | 胡玉麟 |
URN: ctp:ws104425
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