Valerio, Luca, De centro gravitatis solidorum, 1604

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              verticem æqualia alterum alteri: eademque ratione, &
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              triangulum E
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              K
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              H, triangulo BCK: & triangulum FKH,
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              triangulo BDK; erit pyramis KEFH, ſimilis, & æqua­
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              lis pyramidi KBCD: habent autem tria latera tribus
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              lateribus homologis, ideſt æ­
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              qualibus, in directum, prout
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              inter ſe reſpondent, conſtituta;
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              duarum igitur pyramidum KE
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              FH, KBCD, ſimul centrum
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              grauitatis erit K: non aliter
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              duarum pyramidum
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              K
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              GFH,
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              KBDA, ſimul centrum gra­
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              uitatis erit K; totius igitur com
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              poſiti ex quatuor pyramidibus;
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              ideſt duabus oppoſitis ABC­
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              DK, EFGHK, centrum gra
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              uitatis erit idem K. </s>
              <s>Eadem
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              ratione tam duarum pyrami­
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                <figure id="id.043.01.061.1.jpg" xlink:href="043/01/061/1.jpg" number="37"/>
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              dum AEHDK, BCGFK, ſimul, quàm duarum AB­
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              FEK, CDHGK, ſimul centrum grauitatis erit K. </s>
              <s>To­
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              tius igitur parallelepipedi ABCDEFG
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              K
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              , centrum
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              grauitatis erit K. </s>
              <s>Quod demonſtrandum erat. </s>
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              PROPOSITIO XXVI.
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              <s>Si parallelepipedum in duo parallelepipeda
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              ſecetur, ſegmenta axis à centris grauitatis totius
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              parallelepipedi, & partium terminata ex contra­
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              rio parallelepipedi partibus reſpondent. </s>
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