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

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259239LIBER III. ad portionem, RCT, ergo ex æquali omnia quadrata, KG, adom-
11Cor. 19.
huius
.
nia quadrata figuræ, LCRT, demptis omnibus quadratis trilinei,
CLT
, erunt vt, KG, ad portionem, RCT.
Eodem modo oſten-
demus
omnia quadrata, KG, ad omnia quadrata figuræ, VEGY,
demptis
omnibus quadratis trilinei, EGY, eſſe vt, KG, ad portio-
nem
, VEY, quæ conſerua.
Omnia inſuper quadrata, KG, ad omnia quadrata, RY, vt
22Coroll.
26
. l. 2.
probauimus, ſunt vt, KG, ad, RY, item omnia quadrata, RY,
ad
rectangula ſub, RY, R Φ, ſunt vt, RY, ad R Φ, &
tandem re-
33Caroll. 1.
26
. l. 2.
ctangula ſub, R Φ, RY, adrectangula ſub portione, RFV, &

ſub
, RY, ſunt vt, R Φ, ad portionem, RFV, ergo ex æquali
omnia
quadrata, KG, adrectangula ſub portione, RFV, &
ſub,
RY
, erunt vt, KG, ad portionem, RFV, ergo, colligendo, om-
nia
quadrata, KG, ad omnia quadrata figurarum, LCRT, VE
GY
, demptis omnibus quadratis trilineorum, CLT, EGY, &
ad
omnia
quadrata, RY, &
ad rectangula ſemel ſub portione, RFV,
&
ſub, RY, erunt vt, KG, ad portiones, RCT, VEY, RFV,
&
ad rectangulum, RY, . i. vt, KG, ad portionem, TCFEY.
Reliquum eſt, vt comparemus omnia quadrata, KG, ad omnia
quadrata
portionis, RFV, &
ad rectangula ſub eadem, & ſub, RY,
quia
autem, RV, æquatur ipſi, TY, portio, RFV, æquatur por-
tioni
, THY, etiam in ellipſi, quia, RV, TY, ſunt parallelæ,
ideò
omnia quadrata portionis, RFV, ſunt rectangula ſub portio-
ne
, RFV, &
ſub portione, THY, quibus ſi iunxeris rectangula
44A. 23. l. 2. ſub eadem portione, RFV, &
ſub, RY, componentur rectangu-
la
ſub eadem portione, RFV, &
ſub quadrilineo, RTHYV.
Nuncvel, RV, eſt æqualis ipſi, VY, & ſic, RY, erit quadratum,
ſiue
rhombus, vel, RV, non eſt æqualis ipſi, VY, &
tunc in ipſa,
VY
, producta, ſi opus ſit ſumatur, VZ, æqualis, ipſi, VR, &
du-
cta
per, Z, Z Π, ipſi, RV, parallela, ſit conſtitutum, RZ, qua-
dratum
, vel rhombus ipſius, RV:
Omnia ergo quadrata, KG, ad
omnia
quadrata, RZ, habent rationem compoſitam ex ratione
55Diffin. 12.
l
. 1.
quadrati, KL, ad quadratum, R Π, vel ad quadratum, RV, &

ex
ratione ipſius, KB, ad, RV, quæ duæ rationes componunt ra-
6611. l. 2, tionem parallelepipedi rectanguli ſub altitudine, BK, baſi autem
77D. Cor. 4. quadrato, KL, ad cubum, RV.
Siautem, CE, FH, ſint tantum
88Gen. 34.
l
. 2.
diametri, ſic dicemus, nempè, Omnia quadrata, KG, ad omnia
quadrata
, RZ, rhombi habent rationem compoſitam ex ratione,
KL
, ad, R Π, bis ſumpta, &
ex ratione, KB, ad, RV, quæ tres
9923. huius. rationes componunt rationem parallelepiped ſub altitudine, KL,
baſi
parallelogrammo, KG, ad parallelepipedum ſub altitudine,
RV
, baſi autem rhombo, RZ:
Omnia verò quadrata, RZ,

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