Valerio, Luca, De centro gravitatis solidorvm libri tres

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1
PROPOSITIO XVII.
Omnis portio ſphæræ, vel ſphæroidis abſciſſa
duobus planis parallelis, alteroper centrum du­
cto, ad cy lindrum, vel cylindri portionem, cuius
baſis eſt eadem, quæ maior baſis portionis, & eadem
altitudo; eam habet proportionem, quam rectan­
gulum contentum ijs, quæ à centro minoris baſis
fiunt axis ſphæræ, vel ſphæroidis ſegmentis, vnà
cum duabus tertiis quadrati axis portionis; ad
ſphæræ, vel ſphæroidis dimidij axis quadratum.
Sit portio NACO ſphæræ, vel ſphærodij, cuius cen­
trum D, axis autem axi portionis congruens BEDR,
abſciſsa duobus planis parallelis altero per centrum D, ſe­
ctionem faciente circulum
maximum, vel ellipſim,
cuius diameter NO, & ſu­
per dictam ſectionem, cir­
ca axem ED, ſtet cylin­
drus, vel portio cylindrica
NM, abſciſsa ijſdem pla­
nis, quibus portio NAC
O, à cylindro, vel portio­
ne cylindrica NG, ſit cir­
cumſcripta hemiſphærio,
vel hemiſphæroidi NBO:
qua ratione erit cylindri,
155[Figure 155]
vel portionis cylindricæ NM baſis eadem, quæ maior
baſis portionis NACO, circulus ſcilicet, vel ellipſis cir­
ca NO, & eadem altitudo portioni.
Dico portionem

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