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<s>Circuli, & Ellyp&longs;is idem e&longs;t centrum grauita­<lb/> tis, & figuræ. </s></p>
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<s>Sit circulus, vel ellyp&longs;is ABCD, cuius centrum E. <lb/> <!-- KEEP S--></s>
<s>Dico centrum grauitatis figuræ ABCD, e&longs;se punctum E. <lb/> <!-- KEEP S--></s>
<s>Ducantur enim duæ diametri ad rectos inter &longs;e angulos <lb/> AC, BD; in ellyp&longs;i autem &longs;int diametri coniugatæ. <lb/> </s>
<s>Quoniam igitur omnes rectæ lineæ, quæ in &longs;emicirculo, <lb/> vel dimidia ellyp&longs;i diametro ducantur parallelæ bifariam <lb/> &longs;ecantur à &longs;emidiametro, & quo à ba&longs;i remotiores, eo &longs;unt <lb/> <figure id="id.043.01.058.1.jpg" xlink:href="043/01/058/1.jpg"/><lb/> minores; erit centrum grauitatis &longs;emicirculi, &longs;iue dimidiæ <lb/> ellyp&longs;is ABC, in linea BE; &longs;icut & &longs;emicirculi, &longs;iue di­<lb/> midiæ ellyp&longs;is ADC, centrum grauitatis in linea DE. <lb/> e&longs;t autem BED, vna recta linea: in diametro igitur BD, <lb/> erit centrum grauitatis circuli, &longs;iue ellyp&longs;is ABCD. <lb/> <!-- KEEP S--></s>
<s>Eadem ratione o&longs;tenderemus idem centrum grauitatis e&longs;se <lb/> in altera diametro AC: in communi igitur vtriu&longs;que &longs;e­<lb/> ctione puncto E. <!-- KEEP S--></s>
<s>Quod demon&longs;trandum erat. </s></p>
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