Valerio, Luca, De centro gravitatis solidorum, 1604
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              PROPOSITIO XXX.
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              <s>Omnis octaedri idem eſt centrum grauitatis,
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              & figuræ. </s>
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              <s>Eſto octaedrum ABCDEF, cuius centrum G. </s>
              <s>Di­
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              co G, eſse centrum grauitatis octaedri ABCDEF.
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              <s>Ductis enim axibus AC, BD, EF, communis eorum
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              ſectio erit centrum G, in quo axes bifariam ſecabuntur:
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              omnium autem angulorum, qui ad G, bini qui que ad
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              verticem ſunt æquales, qui æqualibus altera alteri rectis
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              continentur; ſimilia igi­
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              tur, & æqualia erunt trian
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              gula, nimirum EBG,
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              GDF, & ECG, ipſi
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              GFA, & BCG, ipſi
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              GDA: igitur & BCE,
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              ipſi ADF; pyramis igi­
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              tur EBCG, ſimilis, &
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              æqualis eſt pyramidi A
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              DFG, quarum latera ho
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              mologa ſunt indirectum
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              inter ſe conſtituta; dua­
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              rum igitur pyramidum
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              EBCG, ADFG, ſimul centrum grauitatis erit G.
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              <s>Eadem ratione ſex reliquarum pyramidum binis quibuſ­
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              que oppoſitis ſimul ſumptis centrum grauitatis erit G.
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              <s>Totius igitur octaedri ABCDEF, centrum grauitatis
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              erit G. </s>
              <s>Quod demonſtrandum erat. </s>
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