Valerio, Luca, De centro gravitatis solidorvm libri tres

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1à centro G, æquè diſtant, erit EG, æqualis GF. Dico
portionis ABCD centrum grauitatis eſſe G.
Deſcripta
enim figura, vt ſupra fecimus, intelligantur duo coni re­
ctanguli GNO, GPQ, vertice G, communi, axibus
autem eorum EG, GF: & cylindrus LM, portioni cir­
cumſcriptus circa eun­
dem axim EF, cuius ba
ſis æqualis eſt circulo
maximo: & ſumatur EH
ipſius EG, pars quar­
ta, itemque FK, pars
quarta ipſius FG.
Quo­
niam igitur conorum G
NO, PGO, axes FG,
GH, ſunt æquales, re­
liquæ KG, GH, æqua
120[Figure 120]
les erunt; centra autem grauitatis conorum ſunt K, H; pun­
ctum igitur G eſt centrum grauitatis compoſiti ex duobus
conis æqualibus GNO, GPQ, hoc eſt reliqui ex cylin­
dro LM, dempta ABCD, portione, ex ante demonſtra­
tis: ſed idem G eſt centrum grauitatis totius cylindri LM;
reliquæ igitur ABCD, portionis centrum grauitatis erit
G.
Quod demonſtrandum erat.
PROPOSITIO XL.
Omnis portionis ſphæræ abſciſſæ duobus pla­
nis parallelis centrum intercipientibus, & à cen­
tro non æqualiter diſtantibus centrum grauitatis
eſt in axe primum bifariam ſecto: Deinde ſumpta
ad minorem baſim portionis quarta parte ſegmen
ti axis, quod minorem baſim attingit: & ad maio-

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