Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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1diuidendo figura ſolida inſcripta ad dictam exceſſus par­
tem, ut τε ad cπ. & quoniam à cono, ſeu coni portione,
cuius grauitatis centrum eſt e, aufertur figura inſcripta,
cuius centrum ρ· reſiduæ magnitudinis compoſitæ cx par
te exceſſus, quæ intra coni, uel coni portionis ſuperficiem
continetur, centrum grauitatis erit in linea e protracta,
atque in puncto t.
quod eſt abſurdum. conſtat ergo centrum
grauitatis coni, uel coni portionis, eſſe in axe bd: quod de
monſtrandum propoſuimus.
THEOREMA XI. PROPOSITIO XV.
Cuiuslibet portionis ſphæræ uel ſphæroidis,
quæ dimidia maior non ſit: itemque cuiuslibet por
tionis conoidis, uel abſciſſæ plano ad axem recto,
uel non recto, centrum grauitatis in axe con­
ſiſtit.
Demonſtratio ſimilis erit ei, quam ſupra in cono, uel co
ni portione attulimus, ne toties eadem fruſtra iterentur.
38[Figure 38]

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