Valerio, Luca, De centro gravitatis solidorvm libri tres

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            <p type="main">
              <s>
                <pb xlink:href="043/01/120.jpg" pagenum="33"/>
              que LK, fiat vt dupla ipſius AD vna cum BC ad du­
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              plam ipſius BC vna cum AD, ita LR ad RK. </s>
              <s>Dico
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              priſmatis AG centrum grauitatis eſse R. </s>
              <s>Ducantur enim
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              per puncta L, K lateribus priſmatis, atque ideo inter ſe
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              parallelæ MN, OP, quæ
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              ob centra K, L, ſecabunt
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              oppoſita parallelogrammo­
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              rum latera bifariam, eas
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              ſectiones connectant MO,
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              NP, ipſique MN, vel
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              OP, parallela ducatur Q
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              RS. </s>
              <s>Quoniam igitur eſt
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              vt LR ad R
                <emph type="italics"/>
              K
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              , hoc eſt vt
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              dupla ipſius AD vna cum
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              BC ad duplam ipſius BC
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              vna cum AD, ita OQ ad
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              QM, & recta MO bifa­
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                <figure id="id.043.01.120.1.jpg" xlink:href="043/01/120/1.jpg" number="92"/>
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              riam ſecat AC trapezij latera parallela, punctum Q, AC
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              trapezij centrum grauitatis; ſimiliter & punctum S erit EG,
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              trapezij centrum grauitatis: priſmatis igitur AG axis erit
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              QS, & centrum grauitatis R, quod eſt in medio axis.
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              </s>
              <s>Omnis igitur priſmatis baſim habentis trapezium, &c.
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              </s>
              <s>Quod demonſtrandum erat. </s>
            </p>
            <p type="head">
              <s>
                <emph type="italics"/>
              PROPOSITIO XXI.
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              </s>
            </p>
            <p type="main">
              <s>Si à quolibet prædicto priſmate duo priſmata
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              beſes habentia triangulas ſint ita abſciſſa, vt pa­
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              rallelepipedum relinquant baſim habens minus
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              parallelogrammorum inter ſe parallelorum præ­
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              dicti priſmatis, maioris autem partes æqualia pa­
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              rallelogramma ipſum parallelepipedum relin­</s>
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