Valerio, Luca, De centro gravitatis solidorum, 1604

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    <archimedes>
      <text>
        <body>
          <chap>
            <p type="main">
              <s>
                <pb xlink:href="043/01/066.jpg" pagenum="58"/>
              trum grauitatis duarum magnitudinum A, C, ſimul.
                <lb/>
              </s>
              <s>Rurſus quoniam recta BD, coniungit duo centra gra­
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              uitatis duarum magnitu­
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              dinum B ſcilicet, & AC,
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              erit compoſitæ ACB, in
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              recta BD, centrum graui
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              tatis: eſt autem illud E.
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              </s>
              <s>Quoniam igitur in quo
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              plano eſt recta BD, in
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              eodem ſunt duo puncta
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              B, E, in quo autem pla­
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              no eſt recta BD, in eo­
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              dem eſt recta AC, &
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              puncta A, C; in quo igi­
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              tur plano ſunt puncta A,
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              C, in eodem erunt pun­
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              cta B, E; quatuor igitur puncta A, B, C, E, erunt in eodem
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              plano; Quod demonſtr andum erat. </s>
            </p>
            <figure id="id.043.01.066.1.jpg" xlink:href="043/01/066/1.jpg" number="42"/>
            <p type="head">
              <s>
                <emph type="italics"/>
              PROPOSITIO XXIX.
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              </s>
            </p>
            <p type="main">
              <s>Si à cuiuslibet trianguli centro, & tribus an­
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              gulis quatuor rectæ inter ſe parallelæ plano trian
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              guli inſiſtant: tres autem magnitudines æquales
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              habeant centra grauitatis in ijs tribus, quæ ad
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              angulos; trium magnitudinum ſimul centrum
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              grauitatis erit in ea, quæ ad trianguli centrum
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              terminatur. </s>
            </p>
            <p type="main">
              <s>Sit triangulum ABC, cuius centrum N, à tribus au­
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              tem angulis A, B, C, & centro N, inſiſtant plano trian-</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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