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

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301281LIBER III. tem axim, TX, igitur cyhndrus genitus in reuolutione ex, AX,
196[Figure 196] dempto cylindro genito
ex
, CX, ad ſolidum ge-
nitum
in reuolutione ex
ellipſi
, BDMG, erit vt,
AR
, ad ellipſim, BDM
G
;
idem accidet, ſireuo-
lutio
ſiat circa axem pa-
rallelam
ipſi, AC, inclu-
ſam
duabus, FA, RC,
verſus
, A, C, puncta pro-
ductis
:
vocetur autem ſo-
lidum
genitum inreuolu-
tione
ex ellipſi, BDMG, anulus latus ellipticus altera parte ſtrictior.
HInc inſimul patet, quod faſcia ſolida cylindrica (vt ita dicam)
in
reuolutione circa, TX, genita ex, AR, ad anulum geni-
tum
ex ellipſi, BDMG, in eadem reuolutione, eſt vt cylindrus ge-
nitus
ex, AR, dum reuolutio ſit circa, CR, ad anulum ſtrictum el-
lipticum
altera parte latiorem in eadem reuolutione circa, CR, at-
ellipſi
, BDMG, genitum;
nam ambo ſunt, vt, AR, ad ellipſim,
BDMG
, dem patet pro ſolidis ſimilaribus, &
c. Quia verò dicta fa-
ſcia
ſolida genita ab, AR, ad cylindrum ab eodem, AR, genitum
eſt
, vt reſiduum quadrati, FX, dempto quadrato, RX, ad quadra-
tum
, FR, eſt.
n. cylindrus genitus ab, AX, ad cylindrum genitum
ab
, AR, vt quadratum, FX, ad quadratum, FR, cylindrus item
genitusà
, CX, ad eundem cy ndrum genitum ab, AR, eſt vt qua-
dratum
, RX, ad quadratum, RF, ergo hoc cylindro dempto à cy-
lindro
genito ab, AX, reliqua faſcia ſolida genita ex, AR, ad cy-
lindrum
genitum ex eodem, AR, erit vt reſiduum quadrati, FX, ab
eo
dempto quadiato, RX, ad quadratum, FR, hanc ergo ratio-
nem
habebit etiam anulus latus ellipticus altera parte ſtrictior ad
anulum
ſtrictum ellipticum altera parte latiorem ex eadem ellipſi, B
DMG
, genitum;
quia vero reſiduum quadrati, FX, dempto qua-
drato
, RX, eſtrectangulum ſub, XR, RF, bis cum quadrato, FR,
ideſt
rectangulum ſub, XF, FR, cum rectangulo ſub, XR, RF, .
i.
rectangulum ſub compoſita ex, RX, XF, & iub, FR, ideò dictus
anulus
latus ad dictum anulum ſtrictum, erit vt rectangulum ſub
compoſita
ex, RX, XF, &
ſub, FR, ad quadratum, FR, . i. erit
vt
compoſita ex, FX, XR, ad, RF, nempè vt, VR, ad, RF.

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