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

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Sit parabola, cuius baſis, FG, ad axim, vel diametrum, CX, or-
dinatim
applicata;
ad baſim autem, FG, ſit etiam ordinatim appli-
cata
, AN, vtcunq;
diuidens baſim, FG, in puncto, N, ſiat autem
parallelogrammum
, RN, &
triangulum, AFN, ſublateribus, A
N
, NF, vel ſub, AN, NG;
Vel ſint duæ vtcunque ad baſim, FG,
ordinatim
applicatæ, AN, CX, ſiat autem parallelogrammum, &

triangulum
ſub, AN, NX, vel ſub, CX, XN.
Dico parallelogram-
203[Figure 203] mum, RN, veltrian-
gulum
, FAN, ad
portionem
, AFN,
parabole
, FCG, pa-
rallelogrammo
, RN,
inſcriptam
, eſſe in ra-
tione
nota.
Similiter
parallelogrammum
,
ZX
, &
triangulum,
NCX
, ad portio-
nem
, ACXN, habe-
re
rationem notam.
Producatur, CX, vt-
cunque
in, E, &
cir-
ca
ſemiaxes, vel ſemi-
diametros
coniuga-
tas
, FX, XE, intel-
ligatur
deſcriptus ſe-
micirculus
, velſemi-
ellipſis
, FEG, pro-
ducantur
deinde, RF, ZN, indeſinitè, ſecetque, ZN, curuam ſe-
micirculi
, vel ſemiellipſis, FEG, in puncto, O, &
compleantur pa-
rallelogramma
, VN, RX, ſumatur deindein, FN, vtcunq;
pun-
ctum
, S, per quodipſi, CE, parallela ducatur, YT, ſecans curnam
parabolæ
in, I, curuam autem, FEG, in, M;
eſt ergo, AN, ad, I
11Exantec. S, vt rectangulum, GNF, ad rectangulum, GSF, eſt autem etiam
2240. Et
Sch
. 1. 1.
quadratum, ON, ad quadratum, SM, vt rectangulum, GNF, ad
rectangulum
, GSF, ergo, AN, vel, YS, ad, SI, erit vt quadra
tum
, NO, vel vt quadratum, TS, ad quadratum, SM, ſunt au-
tem
, RN, NV, parallelogramma in eiſdem baſibus, &
altitudini-
33Coroll.3.
26
. lib. 2.
bus cum portionibus, AFN, NFO, &
punctum, S, ſumptum eſt
vtcunque
, repertumque eſt, vt, YS, ad, SI, ita eſſe quadratum,

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