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

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176156GEOMETRIÆ quoties, BD, ſecta eſſe ſupponitur, exceptis tamen extremis, vt ex.
gr. ipſa, CI, in qua parte, CI, quæin recta, CI, feparari debuiſ-
ſent
per lineas, AEC, AFI, in puncta, C, I, partibus, BE, FD,
reſpondentia
degenerauerunt.
Dico quæcunque demonſtrantur in
linea
, BD, circa quadrata, vel rectangula, illi, vel illius partibus ap-
plicata
, verificari de omnibus quadratis totius figurę, BADC, ſiue
partium
eiuſdem figuræ per dictas lineas conſtitutarum, ſiue de re-
ctangulis
ſub eiuſdem partibus.
Vtex gr. quia in 3. Propoſ. lib. 2.
11Vide D.
Defin
. 8.
huius
.
Elem.
oſtenditur rectangulum ſub, BD, DF, æquari rectangulo
ſub
, BFD, cum quadrato, FD, ſic dico verum eſſe rectangula ſub
101[Figure 101] figura, ABCD, &
figura, ADI, æquari re-
ctangulis
ſub figuris, ABIF, ADIF, cum om-
nibus
quadratis figuræ, ADIF, ſi enim aliam
vtcunque
duxerimus regulæ, BD, parallelam,
vt
, HO, ſecantem lineas, AC, in, M, &
, A
I
, in, N, verum eſſe comperiemus rectangulum,
HON
, æquari rectangulo, HNO, cum qua-
drato
, NO, &
idem in cęteris regulę, BD, pa-
rallelis
in figura, ABCD, ductis reperiemus,
ergo
verum erit rectangula illa ſimul collecta, ideſt rectangula ſub fi-
22Coroll. 4.
huius
.
gura, ABID, &
figura, ADI, æquari rectangulis ſub figuris, AB
I
, ADI, cum omnibus quadratis, ADI, quod 3.
Propoſit. 2. lib.
Elem. reſpondet.
_R_Ectangula ſub figura indiuiſa, ABID, & ſub diuiſa, ACD, per
lineam
, AI, æquari rectangulis ſub indiuiſa, ABID, &
ſub
partibus
diuiſæ, quæ ſunt, ACI, AID.

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