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

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258238GEOMETRIÆ parallelogrammo, AG, altitudine, FI, ad cylindricum ſub baſi por-
tione, TCFEY, altitudine, IM, vna cum, {1/6}, cubi, TY.
In elli-
pſi verò, vt parallelepipedum ſub baſi parallelogrammo, AG, alti-
tudine, FI, ad cylindricum ſub baſi portione, TCFEY, altitudi-
ne, MI, vna cum ea parte cubi, TY, ad quam eiuſdem cubi ſexta
pars ſit, vt quadratum, CE, primę diametri, ad quadratum ſecun-
dæ .
ſ. ad quadratum, FH, vel, ſi diametri non ſint axes, vna cum
ea parte parallelepipedi ſub, TY, &
rhombo, RZ, ad quam illius
pars ſexta ſit, vt quadratum, CE, primæ diametri ad quadratum
ſecundæ.
Ducantur per, T, Y, ipſi, PQ, parallelæ, Τ Δ, Υ Φ, ſe-
cantes curuam, CFE, in punctis, R, V, quæ iungantur recta, R
V, producta in, B, K, quoniam ergo, EC, eſt diameter, ad quam
160[Figure 160] ordinatim applicantur, RT, VY, eas
quoq;
bifariam ſecabit, eſt autem, ST,
æqualis, XY, ob parallelogrammum,
SY, ergo, VX, erit etiam æqualis ipſi,
RS, &
tota, VY, toti, RT, cui etiam
eſt parallela, ergo, RV, TY, ſunt etiam
æquales, &
parallelæ, eſtque, RV, in,
M, bifariam ſecta.
Diuidamus igitur omnia quadrata fi-
guræ, LCFEG, demptis omnibus
quadratis trilineorum, CLT, EGY, in
omnia quadrata figuræ, LCRT, dem-
ptis omnibus quadratis trilinei, LCT,
in omnia quadrata figuræ, GEVY,
demptis omnibus quadratis trilinei, E
GY, &
in omnia quadrata figuræ, TR
FVY.
Rurſus per rectam, RV, diui-
11Per D. 23.
lib. 2.
duntur omnia quadrata figuræ, TRF
VY, in omnia quadrata, YR, in om-
nia quadrata portionis, RFV, &
in re-
ctangula bis ſub, YR, &
portione, R
FV, his ſeparatis, ad eorum ſingula comparemus nunc omnia qua-
drata parallelogrammi, KG.
Igitur omnia quadrata, KG, ad omnia quadrata, RY, ſunt vt,
22@o. Lib. 2. KB, ad, RV, vel vt parallelogrammum, KG, ad parallelogram-
mum, RY;
omnia inſuper quadrata, KG, ad omnia quadrata, K
T, ſunt vt, BK, ad, KR, .
i. vt, KG, ad, KT; item omnia qua-
drata, KT, ad omnia quadrata figuræ, LCRT, demptis omnibus
quadratis trilinei, LCT, .
i. ad omnia quadrata portionis, RCT,
cum rectangulis bis ſub eadem, &
ſub trilineo, CLT, ſunt vt,

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