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

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224204GEOMETRIÆ ſunt vt quadratum, VR, ad quadratum, CR, . ſ. vt rectangulum,
11Ex 40. l. 1.
& eiuidẽ
Scholio.
AOD, vel quadratum, AO, ad rectangulum, DRA, omnia au-
tem quadrata parallelogrammi, BR, ad omnia quadrata ſemipor-
137[Figure 137] tionis, ICRM, ſunt vt rectangulum, D
RA, ad rectangulum ſub, DR, &
ſub
compoſita ex, {1/2}, RM, &
ex, MA, vna
cum rectangulo ſub, RM, &
ſub com-
poſita ex, {1/6}, RM, &
, {1/2}, MA, ergo ex
22Ex anter. æquali omnia quadrata parallelogram-
mi, GR, ad omnia quadrata ſemiportio-
nis, ICRM, vel omnia quadrata paral-
lelogrammi, GX, ad omnia quadrata
portionis, ICFS, erunt vt quadratum,
AO, ad rectangulum ſub, DR, &
ſub compoſita ex, {1/2}, RM, &
ex, MA, vna cum rectangulo ſub, RM, &
ſub compoſita ex, {1/6}, R
33Ex 9. & B.
Cor. 22.
lib. 2.
M, &
, {1/2}, MA; quod etiam pater, ſi parallelogrammum, GX, non
ſit circa axim, vel diametrum, MR, quod erat oſtendendum.
THEOREMA V. PROPOS. V.
SI in circulo, vel ellipſi ducantur coniugati axes, vel dia-
metri, in altera autem eorundem ſit tamquam in baſi pa-
rallelogrammum circa eundem axim, vel diametrum cum cir-
culo, vel ellipſi, circa quæm ſit etiam triangulus, ſed in baſi
oppoſita baſi parallelogrammi, ſumatur autem in dicta axi,
vel diametro vtcunq;
punctum, per quod baſibus dictis aga-
tur parallela;
quadratum eiuſdem parallelæ trianguli lateri-
bus interceptæ æquabitur reliquo quadrati eius, quæ inter-
cipitur lateribus parallelogrammi, dempto quadrato eius,
quæ intra circulum, vel ellipſim concludetur.
Sit circulus, vel ellipſis, BDHF, eius coniugati axes, vel diame-
tri, BH, DF, in altera autem earum, vtin, DF, tanquam in baſi,
&
circa axim, vel diametrum, BE, ſit parallelogrammum, AF, cir-
ca eundem verſo4;
, ſed in baſi, AC, ſit triangulum, AEC, ſumatur
autem in, BE, vtcunque punctum, M, per quodipſi, DF, agatur
parallela, VR, ſecans curuam, DBF, in, T, I, &
latera trianguli,
AEC, in, S, N.
Dico ergo quadratum, SN, æquari reliquo qua-
drati, VR, dempto quadrato, TI.
Nam rectangulum, HEB, ad
rectangulum, HMB, eſt vt quadratum, FE, vel quadratum,

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