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

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549529LIBER VII.
Hoc oſtendetur eodem modo, ac inſupradicta prop. 30. lib. 3.
mutatis tantum ſupradictis nominibus, nempe ſi vbi dicimus re-
ctangula
ſub duabus quibuſdam figuris, hic dicamus rectangulum
ſolidum
ſub eiſdem figuris, ſicuti etiam cumdicuntur omnia qua-
360[Figure 360] drata cuiuſdam figuræ, nos illius vice
nunc
ſubſtituemus nomen quadrati ſo-
lidi
eiuſdem figuræ, vt ſupra dicebatur.
Igitur cum rectangulum ſolidum ſub
trapezio
, ADEC, diuiſo per lineam, B
11SI.huius@ E, &
ſub triangulo, CEF, indiuiſo, æ-
quetur
rectangulo ſolido ſub, AE, &

triangulo
, CEF, vel triangulo, BEC, &

rectangulo
ſolido ſub triangulo, BEC,
&
triangulo, CEF, primò patet rectan-
gulum
ſolidum ſub, AE, EC, adrectang.
ſolidum ſub, AE, & triã-
gulo
, BEC, eſſe vt, BF, ad, BEC, ideſt vt, DE, ad {1/2}.
DE, eſt enim,
BF
, duplum trianguli, BEC.
Similiter rectangulum ſolidum ſub,
22Coroll.1.
13
. huius.
Coroll
.2.
13
. huius.
Coroll
.2,
14
.huius.
AE, EC, ad quadratum ſolidum, BF, eſt vt rectangulum, DEF, ad
quadratum
, EF, ideſt vt, DE, ad, EF, quadratum verò ſolidum, B
F
, cum ſit triplum quadrati ſolidi, CEF, &
quadrati ſolidi, BEC,
erit
etiam triplum duorum rectangulorum ſolidorum ſub, BEC, CE
F
, (quadratum ſolidum enim, BF, oſtenſum eſt æquari quadratis
ſolidis
, BEC, CEF, cum duobus rectang.
ſolidis ſub, BEC, CEF,)
33Coro. 15.
huius
.
&
ideò erit ſexcuplum rectanguli ſolidi, ſub, BEC, CEF, ideſt erit
ad
illud vt, EF, ad ſui {1/6}.
ergo ex æquali rectangulum ſolidum ſub,
AE
, EC, ad rectangulum ſolidum ſub, BEC, CEF, erit vt, DE, ad
{1/6}.
EF, & ad rectangulum ſolidum ſub, AE, & triangulo, BEC, ſeu,
CEF
, oſtenſum eſt eſſe vt, DE, ad {1/2}.
DE, ergo colligendo rectan-
gulum
ſolidum ſub, AE, EC, ad rectangulum ſolidum ſub, AE, CE
F
, &
ſub, CBE, CEF, ideſt ſub trapezio, CADE, & triangulo, CE
F
, erit vt, DE, ad compoſitam ex {1/2}.
DE, & {1/6}. EF, quod oſtendere
opuserat
.

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