Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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            <p type="main">
              <s id="s.000711">
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              fruſtum ad. </s>
              <s id="s.000712">Sed pyramis q æqualis eſt fruſto à pyramide
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              abſciſſo, ut demonſtrauimus. </s>
              <s id="s.000713">ergo & conus, uel coni por­
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              tio q, cuius baſis ex tribus circulis, uel ellipſibus ab, ef, cd
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              conſtat, & altitudo eadem, quæ fruſti: ipſi fruſto ad eſt æ­
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              qualis. </s>
              <s id="s.000714">atque illud eſt, quod demonſtrare oportebat.</s>
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              9 huius</s>
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              2. duode­
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              cimi.</s>
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              7. de co­
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              noidibus
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              & ſphæ­
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              roidibus</s>
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              6. II. duo
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              decimi</s>
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              <s id="s.000719">THEOREMA XXI. PROPOSITIO XXVI.</s>
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              <s id="s.000720">CVIVSLIBET fruſti à pyramide, uel cono,
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              uel coni portione abſcisſi, centrum grauitatis eſt
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              in axe, ita ut eo primum in duas portiones diui­
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              ſo, portio ſuperior, quæ minorem baſim attingit
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              ad portionem reliquam eam habeat proportio­
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              nem, quam duplum lateris, uel diametri maioris
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              baſis, vnà cum latere, uel diametro minoris, ipſi
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              reſpondente, habet ad duplum lateris, uel diame­
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              tri minoris baſis vnà
                <expan abbr="cũ">cum</expan>
              latere, uel diametro ma­
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              ioris: deinde à puncto diuiſionis quarta parte ſu
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              perioris portionis in ipſa ſumpta: & rurſus ab in­
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              ferioris portionis termino, qui eſt ad baſim maio
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              rem, ſumpta quarta parte totius axis: centrum ſit
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              in linea, quæ his finibus continetur, atque in eo li
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              tem propinquiorem minori baſi,
                <expan abbr="eãdem">eandem</expan>
              propor­
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              tionem habeat, quam fruſtum ad
                <expan abbr="pyramidẽ">pyramidem</expan>
              , uel
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              conum, uel coni portionem, cuius baſis ſit ea­
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              dem, quæ baſis maior, & altitudo fruſti altitudini
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              æqualis.</s>
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          </chap>
        </body>
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