Valerio, Luca, De centro gravitatis solidorvm libri tres

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1li igitur minor erit proportio QR, ES ſimul ad EF,
quàm
TV, GX ſimul ad GH. & permutando, minor
proportio
QR, ES ſimul ad TV, GX ſimul quàm EF
ad
GH. & conuertendo, maior proportio GX, TV ſi­
mul
ad ES, QR ſimul, quàm GH ad EF.
Similiter
oſtenderemus
duo ZI, AY, ſimul ad TV, GX, ſimul,
maiorem
habere proportionem, quàm AK ad rectarum
GH
.
Rurſus quoniam puncta N, O, in medio BL, LM,
ſunt
, ipſorum EF, GH, centra grauitatis: duorum autem
QR
, ES ſimul centrum grauitatis eſt in linea NL, pro­
pterea
quòd ES maius eſt quàm QR, & æquales BN,
NL
, quas centra grauitatis ipſorum QR, ES bifariam
diuidunt
, cadet ipſorum QR, ES, ſimul centrum grauita­
tis
propius termino D, quàm ipſius EF centrum grauitatis,
& duobus centris N, O, interijcietur.
Eademque ratio­
ne
duorum TV, GX, ſimul centrum grauitatis termino
D
erit propinquius quàm ipſius GH centrum grauitatis,
& duobus centris O, P, duorum GH, AK interijcietur.
Et duorum ZI, AY ſimul centrum grauitatis propin­
quius
erit D termino, quàm P ipſius AK.
Quoniam
igitur
omnia primarum magnitudinum, ex quibus conſtat
figura
ſecundo circumſcripta centra grauitatis in eadem re
cta
linea BD, diſpoſita ſunt alternatim ad centra grauita­
tis
ſecundarum primis multitudine æqualium, ex quibus
data
figura conſtat ipſi ABC figuræ circumſcripta, ſunt
termino
D propinquiora, quàm centra grauitatis ſecunda­
rum
, ſi bina, prout inter ſe reſpondent comparentur: maior
autem
proportio oſtenſa eſt primæ ad ſecundam in primis,
quàm
primæ ad ſecundam in ſecundis: & ſecundæ ad ter­
tiam
in primis, quàm ſecundæ ad tertiam in ſecundis,
ſumpto
ordine à termino D, erit centrum grauitatis om­
nium
primarum ſimul, ideſt figuræ ipſi ABC figuræ
ſecundo
circumſcriptæ termino D propinquius, quàm
datæ
figuræ eidem ABC figuræ primo circumſcriptæ cen­

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