Commandino, Federico, Liber de centro gravitatis solidorum, 1565
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              <s id="s.000148">
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              quo ſcilicet ln, om conueniunt. </s>
              <s id="s.000149">Poſtremo in figura
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              aplqbrmsctnudxoy centrum grauitatis trian
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              guli pay, & trapezii ploy eſt in linea az: trapeziorum
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              uero lqxo, qbdx centrum eſt in linea zk: &
                <expan abbr="trapeziorũ">trapeziorum</expan>
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              brud, rmnu in k
                <foreign lang="grc">φ·</foreign>
              & denique trapezii mstn; & triangu
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              li sct in
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              c. </s>
              <s id="s.000150">quare magnitudinis ex his compoſitæ
                <expan abbr="centrũ">centrum</expan>
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              in linea ac conſiſtit. </s>
              <s id="s.000151">Rurſus trianguli qbr, & trapezii ql
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              mr centrum eſt in linea b
                <foreign lang="grc">χ.</foreign>
              trapeziorum lpsm, pacs,
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              aytc, yont in linea
                <foreign lang="grc">χφ·</foreign>
                <expan abbr="trapeziiq;">trapeziique</expan>
              oxun, & trianguli
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              xdu centrum in
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              d. </s>
              <s id="s.000152">totius ergo magnitudinis centrum
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              eſt in linea bd. </s>
              <s id="s.000153">ex quo ſequitur, centrum grauitatis figuræ
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              aplqbrmsctnudxoy eſſe
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              K, lineis ſcilicet ac,
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              bd commune, quæ omnia demonſtrare oportebat.</s>
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              8. primi</s>
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              33. primi</s>
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              28. primi.</s>
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              13. Archi
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              medis.</s>
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              Vltima.</s>
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              <s id="s.000159">THEOREMA III. PROPOSITIO III.</s>
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              <s id="s.000160">Cuiuslibet portio­
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              nis circuli, & ellipſis,
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              quæ dimidia non ſit
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              maior, centrum graui
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              tatis in portionis dia­
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              metro conſiſtit.</s>
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              <s id="s.000161">HOC eodem prorſus
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              modo demonſtrabitur,
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              quo in libro de centro gra
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              uitatis planorum ab Ar­
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              chimede
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              eſt,
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              in portione
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              recta
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              linea, & rectanguli coni ſe
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              ctione grauitatis
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              eſſe in diametro portio­
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              nis. </s>
              <s id="s.000162">Et ita demonſtrari po
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              </s>
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