Valerio, Luca, De centro gravitatis solidorum, 1604

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              cum quæ tangentium concurſum, & centrum fi­
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              guræ iungit interiecta. </s>
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              <s>Sit circulus, vel ellipſis ABCD, cuius diametri con­
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              iugatæ AC, BED, & figuram tangentes BF, GF, con
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              ueniant in puncto F; (parallelæ enim erunt vtraque alteri
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              coniugatorum diametrorum:) & recta FE iungatur, & ex
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              quolibet puncto G, in recta BE ducatur ipſi AC paral­
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              lela GLKH. </s>
              <s>Dico rectangulum GKH bis vnà cum
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              quadrato KH æquale eſſe quadrato GL. </s>
              <s>Quoniam
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              enim rectangulum BGD æquale eſt rectangulo BGE
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                <figure id="id.043.01.182.1.jpg" xlink:href="043/01/182/1.jpg" number="137"/>
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              bis vnà cum quadrato BG: & rectangulum BED, eſt
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              quadratum BE, erit vt rectangulum BED, ad re­
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              ctangulum BGD, ita quadratum BE, ad rectangu­
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              lum BGE bis, vnà cum quadrato BG: ſed vt rectangu­
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              lum BED, ad rectangulum BGD, ita eſt quadratum EC,
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              hoc eſt quadratum GH ad quadratum GK, ex primo
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              conicorum, vt igitur eſt quadratum BE ad rectangulum
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              BGE bis, vnà cum quadrato BG, ita erit quadratum
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              GH ad quadratum GK. </s>
              <s>Rurſus quia eſt vt BE ad EG,
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              ita BF ad GL, propter ſimilitudinem triangulorum; erit
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              vt quadratum BE ad quadratum EG, ita quadratum </s>
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        </body>
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