Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s id="s.000367">
                <pb pagenum="16" xlink:href="023/01/039.jpg"/>
                <figure id="id.023.01.039.1.jpg" xlink:href="023/01/039/1.jpg" number="29"/>
                <lb/>
              ni portionem, ita eſt cylindrus ad cylindrum, uel cylin­
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              dri portio ad cylindri portionem: & ut pyramis ad pyra­
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              midem, ita priſma ad priſma, cum eadem ſit baſis, & æqua
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              lis altitudo; erit cylindrus uel cylindri portio x priſma­
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              ti y æqualis. </s>
              <s id="s.000368">
                <expan abbr="eſtq;">eſtque</expan>
              ut ſpacium gh ad ſpacium x, ita cylin­
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              drus, uel cylindri portio ce ad cylindrum, uel cylindri por­
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              tionem x. </s>
              <s id="s.000369">Conſtat igitur cylindrum uel cylindri
                <expan abbr="portionẽ">portionem</expan>
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              c e, ad priſma y, quippe cuius baſis eſt figura rectilinea in
                <lb/>
                <arrow.to.target n="marg47"/>
                <lb/>
              ſpacio gh deſcripta, eandem proportionem habere, quam
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              ſpacium gh habet ad ſpacium x, hoc eſt ad dictam figuram. </s>
              <lb/>
              <s id="s.000370">quod demonſtrandum fuerat.</s>
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            <p type="margin">
              <s id="s.000371">
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              6. duode
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              cimi.</s>
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            <p type="margin">
              <s id="s.000372">
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              7. quinti</s>
            </p>
            <p type="head">
              <s id="s.000373">THEOREMA IX. PROPOSITIO IX.</s>
            </p>
            <p type="main">
              <s id="s.000374">Si pyramis ſecetur plano baſi æquidiſtante; ſe­
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              ctio erit figura ſimilis ei, quæ eſt baſis, centrum
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              grauitatis in axe habens.</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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