Cavalieri, Buonaventura, Geometria indivisibilibvs continvorvm : noua quadam ratione promota

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558538GEOMETRI Æ pro alis in hac propoſitione ſit pariter regula, extendaturq; hinc
indevt
ſecet EC, vt in, N, HV, vt in, R, &
PV, vt in, Q, ergo, CG,
365[Figure 365] ad, MO, erit vt quadratum, GH,
ad
rectangulum ſub compoſita
ex
, HG, GO, &
ſub, OH, (hoc. n.
deducitur ex prop. 3. lib. 4. quæ
non
dependet à prop.
1. neq; indi-
get
, quod denuò demonſtretur)
ideſt
vt quadratum, GV, ad qua-
dratum
, OR, ſed vt, CG, ad MO,
ita
eſt quadratum, CG, ad rectan-
gulum
ſub, CG, ſeu, NO, &
OM, ergo quadratum, CG, ad rectan-
gulum
, NOM, erit vt quadratum, GV, ad quadratum, OR, &
per-
mutando
quadratum, CG, ad quadratum, GV, erit vt rectan-
gulum
, NOM, ad quadratum, OR, ſic ductis alijs parallelis
euenire
oſtendemus;
ergo ſolidum rectangulum ſub, EG, paral-
lelogrammo
, &
ſemiparabola, CHG, erit proportionaliter ana-
logum
quadrato ſolido quadrantis, HVG, ſecundum regulam,
C
V, ſecundum eandem autem oſtendemus etiam quadratum
ſolidum
, EG, eſſe proportionaliter analogum quadrato ſolido, H
V
, etenim quadratum, CG, ad quadratum, GV, eſt vt quadratum,
NO
, ad quadratum, OQ, vnde vt quadratum, CG, ad quadratum,
GV
, ſic erit quadratum ſolidum, EG, ad quadratum ſolidum, G
P
, &
ſic etiam rectangulum ſolidum ſub, EG, HCG, ad quadratum
ſolidum
, HGV, ergo quadratum ſolidum, EG, ad quadratum ſoli-
dum
, HV, erit vt rectangulum ſolidum ſub, EG, HCG, ad quadra-
tum
ſolidum, HGV, ergo permutando quadratum ſolidum, EG, ad
rectangulum
ſolidum ſub, EG, HCG, erit vt quadratum ſolidum,
HV
, ad quadratum ſolidum, HGV, ſed quadratum ſolidum, HV,
11Elicitur
ex
20. hu-
ius
.
ſequialterum eſt quadrati ſolidi, HGV, cum, VG, tranſeat per cen-
trum
, G, ergo quadratum ſolidum, EG, ſexquialterum erit rectan-
guli
ſolidi ſub, EG, HCG, ſed vt quadratum ſolidum, EG, ad rectan-
gulum
ſolidum ſub, EG, HCG, ita baſis, EG, ad baſim, HCG, ergo,
EG
, erit ſexquialtera, HCG, &
conſequenter, viſa figura prop. 1.
22Cor. 1. 13.
huius
.
lib.
4. erit parallelogrammum, AH, ſequialterum parabolæ, FCH,
quod
oſtendendum erat.

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