Valerio, Luca, De centro gravitatis solidorum, 1604

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              ducantur rectæ GBH, GAF, quæ cum KE, produ­
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              cta conueniant in punctis F, H: & fiant parallelogramma
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              FL, AK. </s>
              <s>Quoniam igitur eſt vt N, ad R, ita BC, ad
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              CA, hoc eſt AD, ad DB, hoc eſt rectangulum AK, ad
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              rectangulum BK; erit permutando vt rectangulum AK,
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              ad N, ita rectangulum BK, ad R; ſed rectangulum BK,
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              eſt pars quarta ipſius R, ergo & rectangulum AK, erit
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              pars quarta ipſius N. </s>
              <s>Rurſus quia eſt vt GD, ad D
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              K
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              ,
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              ita GA, ad AF, & GB, ad BH: ſed GD eſt æqualis
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              DK; ergo & GA, ipſi AF, & GB, ipſi BH, æquales
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              erunt & centra grauita­
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              tis A, quidem rectangu­
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              li MK, B, vero rectan­
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              guli KL, & rectangulum
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              AK, pars quarta ipſius
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              M
                <emph type="italics"/>
              K
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              , quemadmodum
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              & B
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              K
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              ipſius KL; ſed
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              N, rectanguli AK, qua­
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              druplum erat, quemad­
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              modum & R ipſius BK;
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              igitur rectangulum MK,
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              ſpacio N, & rectangulum
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              KL, ſpacio R, æquale
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              erit. </s>
              <s>Sed vt BC, ad CA,
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              ita eſt N, ad R; vt igi­
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              tur BC, ad CA, ita
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                <figure id="id.043.01.042.1.jpg" xlink:href="043/01/042/1.jpg" number="24"/>
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              rectangulum MK, ad rectangulum KL; ſed A eſt cen­
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              trum grauitatis rectanguli MK, & B, rectanguli KL; to­
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              tius ergo rectanguli FL, hoc eſt duorum rectangulorum
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              MK, KL, ſimul centrum grauitatis erit C. </s>
              <s>Sed rectan­
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              gulo MK, æquale eſt ſpacium N; & rectangulo KL, ſpa­
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              cium R. </s>
              <s>Igitur ſi pro rectangulo MK, ſit ſuſpenſum N
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              ſpacium ſecundum centrum grauitatis in puncto A, & pro
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              rectangulo KL, ſpacium R, ſecundum centrum graui-</s>
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