Valerio, Luca, De centro gravitatis solidorvm libri tres

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1
PROPOSIT'IO XXVII.
Sint ſolida grauia A, & B, quorum centra grauitatis
ſint
A, B, ſecundum quæ ſuſpenſa intelligantur A, in
puncto
C, & B, in puncto D, cuiuslibet rectæ GH, quæ
ſit
ita diuiſa in puncto E, vt ſit DE, ad EC, vt eſt A,
ad
B.
Dico ſolida A, E, æquiponderare à longitudini­
bus
DE, EC; hoc eſt vtriuſque ſimul centrum grauita­
tis
eſse E.
Nam ſi A, B, ſint æqualia, manifeſtum eſt
propoſitum
: ſi au­
tem
inæqualia, eſto
maius
A: maior igi
tur
erit DE, quam
EC
. abſcindatur
DF
, æqualis EC:
erit
igitur DE, æ­
qualis
GF: & CD,
vtrin
que producta,
ponatur
DH, æ­
qualis
DF: & CG,
ipſi
CF. & circa
axim
, & altitudinem
GH
, eſto paralle­
lepipedum
KL, æ­
quale
duobus ſo­
39[Figure 39]
lidis
A, B, ſimul & parallelepipedum KL, ſecetur plano
per
punctum F, oppoſitis planis parallelo, in duo paral­
lelepipeda
KN, ML.
Quoniam igitur eſt vt GF, ad
FH
, ita parallelepipedum KN, ad parallelepipedum

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