Valerio, Luca, De centro gravitatis solidorvm libri tres

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              ctum M tranſibit. </s>
              <s>Sed quia PK eſt æqualis KQ, & NL
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              ipſi LO, etiam XM æqualis erit ipſi MZ ob parallelas;
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              cum igitur priſmatum BER, CVH centra grauitatis ſint
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              X, Z; erit vtriuſque priſmatis prædicti ſimul centrum gra­
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              uitatis M. </s>
              <s>Quod eſt propoſitum. </s>
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              PROPOSITIO XXII.
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              <s>Si ſint duæ pyramides æquales, & æque altæ,
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              baſes habentes in eodem plano, quarum vertices
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              recta linea connectens cum ea, quæ baſium centra
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              grauitatis iungit ſit in eodem plano; earum cen­
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              trum grauitatis tamquam vnius magnitudinis re­
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              ctam lineam, quæ inter vertices, & centra baſium
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              interiectas bifariam ſecat, itadiuidit, vt pars ſu­
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              perior ſit inferioris tripla. </s>
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              <s>Sint duæ
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              pyramides æ­
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              quales, & æ­
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              que altæ, qua­
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              rum baſes in
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              eodem plano
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              AC, DB, ver
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              tices autem
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              G, H, & ba­
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              ſium
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              E,
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              F, iunctæque
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              EF, GH, quas
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              bifariam ſecet recta KL, huius autem pars quarta ſit LM.
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              <s>Dico vtriuſque pyramidis GAC, HDB, ſimul centrum
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              grauitatis eſſe M. </s>
              <s>Iunctis enim GE, HF, ſumantur ea­</s>
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