Valerio, Luca, De centro gravitatis solidorvm libri tres

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1& ſecta BD bifariam in puncto H: deinde ſecundum G
in ipſa BH, centrum grauitatis reliqui dempta portione ex
ſolido KL, ſit portionis ABC in ipſa DH centrum gra
uitatis F, per vim XXXVII ſecundi.
Dico eſſe HG ad GF,
vt ſolidum rectangulum ex BD, DR, DE vnà cum binis
tertiis duorum cuborum
ex BE, ED, ad ſoli­
dum rectangulum ex
BD, BE, ER.
Simi
liter enim vt ſupra de­
monſtrato eſſe vt HG
ad GF, ita portionem
ABC ad ſolidum KL;
quoniamportio ABC
ad ſolidum KL eſt vt
ſolidum ex BD, DR,
DE, vnà cum binis ter
tiis duorum cuborum ex
BE, & ED, ad ſoli­
182[Figure 182]
dum ex BD, BE, ER; erit vt modo dicta antecedens
magnitudo ad dictam conſequentem, ita HG, ad GF.
Quod demonſtrandum erat.
PROPOSITIO XXXVI.
Omnis portionis ſphæræ, vel ſphæroidis ab­
ſciſſæ duobus planis parallelis centrum interci­
pientibus, & ab eo non æqualiter diſtantibus, cen
trum grauitatis eſt in axe, primum bifariam ſecto:
deinde ſecundum centrum grauitatis reliqui dem­
pta portione ex cylindro, vel portione cylindrica,
abſciſſo, vel abſciſſa vnà cum portione, à cylin-

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