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="N10015" n="1">
            <pb xlink:href="X03/01/111.jpg"/>
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            <p type="head">
              <s id="N1127B"> ​第​十​二​款 ​有​三​角​形,​從​角​至​對​線,​於​中​作​一​直
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              ​線,​直​線​內​有​重​之​心​。</s>
              <s id="N11280"/>
            </p>
            <p type="main">
              <s id="N11285"> ​假​如​從a​角​至e i​對​線,​作​一​直​線,
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              ​於o​分​兩​平​分,​必​定a o​之​內​有​重
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              ​心​也​。</s>
              <s id="N1128C">e​至u​亦​然​。</s>
              <s id="N1128F">
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              </s>
            </p>
            <p type="head">
              <s id="N11296"> ​第​十​三​款 ​有​三​角​形,​其​重​心​與​形​心​同​所​。</s>
              <s id="N11299"/>
            </p>
            <p type="main">
              <s id="N1129E"> ​假​如​上​三​角​形,a​為​形​心,​亦​為​重​心​。</s>
              <s id="N112A1"/>
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          </chap>
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