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

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307287LIBER IV.
THEOREMA II. PROPOS. II.
Sint ergo intra parabolam circa axim, veldiametrum, CG, con-
ſtitutam
, duæ adipſum ordinatim applicatæ rectæ lineæ, FH, OM,
parabolas
, OCM, FCH, abſc ndentes.
Dico ergo parabolam, F
CH
, ad parabolam, OCM, eſſe vt cubum, FH, ad cubum, OM;
conſtituantur circa axes, vel diametros, CI, CG, & in eiſdem ba-
ſibus
, OM, FH, cum dictis parabolis parallelogramma, AH, RM.

201[Figure 201] Quoniam ergo ęquiangula paral
1111. Lib. 2. lelogramma habent rationem ex
lateribus
compoſitam, ſunt au-
tem
parallelogramma, AH, R
M
, æquiangula, nam, OM, eſt
parallela
ipſi, FH, ideò paralle-
logrammum
, AH, ad parallelo-
grammum
, RM, habebit ratio-
nem
compoſitam ex ea, quam ha
bet
, FA, ad, RO, .
i. GC, ad,
CI
, .
i. quadratum, FH, ad qua-
2238. Ec
Schol
. 40.
lib
. 1.
dratum, OM, &
ex ea, quam habet, FH, ad, OM, ſed etiam cu-
bus
, FH, ad cubum, OM, habet rationem compoſitam ex ea, quam
habet
quadratum, FH, ad quadratum, OM, &
ex ea, quam ha-
33D. Corol.
4
. Gener.
34
, lib. 2.
bet, FH, ad, OM, ergo parallelogrammum, AH, ad parallelo-
grammum
, RM, &
conſequenter parabola, FCH, ad parabolam,
OCM
, (quia ſunt dictorum parallelogrammorum ſubſexquialterę)
44Exantec. erit vt cubus, FH, ad cubum, OM, quodoſtendere opus erat.

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