Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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        <body>
          <chap>
            <p type="main">
              <s id="s.000102">
                <pb pagenum="3" xlink:href="023/01/013.jpg"/>
              cta bd in g puncto, ducatur cg; & protrahatur ad circuli
                <lb/>
              uſque circumferentiam; quæ ſecet ae in h. </s>
              <s id="s.000103">Similiter conclu
                <lb/>
              demus cg per centrum circuli tranſire: & bifariam ſecate
                <lb/>
              lineam ae;
                <expan abbr="itemq́">itemque</expan>
              ; lineas bd, ae inter ſe æquidiſtantes eſſe.
                <lb/>
              </s>
              <s id="s.000104">Cum igitur cg per centrum circuli tranſeat; & ad
                <expan abbr="punctũ">punctum</expan>
                <lb/>
              f perueniat neceſſe eſt: quòd cdef ſit dimidium circumfe
                <lb/>
                <figure id="id.023.01.013.1.jpg" xlink:href="023/01/013/1.jpg" number="5"/>
                <lb/>
                <arrow.to.target n="marg14"/>
                <lb/>
              rentiæ circuli. </s>
              <s id="s.000105">Quare in eadem
                <lb/>
              diametro cf erunt centra gra
                <lb/>
              uitatis triangulorum bcd,
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              afe, & quadrilateri abde, ex
                <lb/>
              quibus conſtat hexagonum ab
                <lb/>
              cdef. </s>
              <s id="s.000106">perſpicuum eſt igitur in
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              ipſa cf eſſe circuli centrum, &
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              centrum grauitatis hexagoni.
                <lb/>
              </s>
              <s id="s.000107">Rurſus ducta altera diametro
                <lb/>
              ad, eiſdem rationibus oſtende­
                <lb/>
              mus in ipſa utrumque
                <expan abbr="cẽtrum">centrum</expan>
                <lb/>
              ineſſe. </s>
              <s id="s.000108">Centrum ergo grauita­
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              tis hexagoni, & centrum circuli idem erit.</s>
            </p>
            <p type="margin">
              <s id="s.000109">
                <margin.target id="marg14"/>
              13 Archi
                <lb/>
              medis.</s>
              <lb/>
              <s id="s.000110">9.
                <expan abbr="eiusdetilde;">eiusdem</expan>
                <lb/>
              m</s>
            </p>
            <p type="main">
              <s id="s.000111">Sit heptagonum abcdefg æquilaterum atque æquian
                <lb/>
                <figure id="id.023.01.013.2.jpg" xlink:href="023/01/013/2.jpg" number="6"/>
                <lb/>
              gulum in circulo deſcriptum:
                <lb/>
              & iungantur ce, bf, ag: di­
                <lb/>
              uiſa autem ce bifariam in
                <expan abbr="pũtco">pun
                  <lb/>
                cto</expan>
              h: & iuncta dh produca­
                <lb/>
              tur in k. </s>
              <s id="s.000112">non aliter demon­
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              ſtrabimus in linea dk eſſe cen
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              trum circuli, & centrum gra­
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              uitatis trianguli cde, & tra­
                <lb/>
              peziorum bcef, abfg, hoc
                <lb/>
              eſt centrum totius heptago­
                <lb/>
              ni: & rurſus eadem centra in
                <lb/>
              alia diametro cl ſimiliter du­
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              cta contineri. </s>
              <s id="s.000113">Quare & centrum grauitatis heptagoni, &
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              centrum circuli in idem punctum conueniunt. </s>
              <s id="s.000114">Eodem </s>
            </p>
          </chap>
        </body>
      </text>
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