Terentius, Johannes; Zheng, Wang 王徴, Yuan xi qi qi tu shuo lu zui 遠西奇器圖說錄最, [1830]

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          <chap id="N10D00" n="2">
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              <s id="N12810"> ​若​三​角​形​下​是​直​角​形,​其​右​交​左​交
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              ​就​是​股​弦​之​比​例,​等​于​右​左​兩​球​之
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              ​比​例​。</s>
              <s id="N12817">​直​立​曰​股,​斜​行​曰​弦,​下​底​曰​勾​。</s>
              <s id="N1281A">​直​立​與​下​底​相​交,​即​名​勾​股​。</s>
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              <s id="N12824">​第​七​十​八​款 ​有​三​角​形​同​前,​但​不​繫​于​鉤,​依​賴​滑
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              ​車​而​過,​垂​重​向​下​。</s>
              <s id="N12829">​垂​重​與​斜​重​比​例
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              ​亦​是​股​弦​之​比​例​。</s>
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              <s id="N12833"> ​鉤​與​滑​車​似​不​同​類,​然​重​從​鉤​內​過
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              ​與​從​滑​車​之​外​過​則​同​一​行​也,​故​其
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              ​比​例​亦​同​。</s>
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