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

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9373LIBERI.
Sint cylindrici quicunque, AH, KY; ſeu conici in ijſdem baſibus,
&
altitudinibus (vt vna vice vtriuſq; demonſtrationem abſoluamus)
NLH
, VXY, ſimiles iuxta definit.
7. huius. Dico eoſdem etiam
eſſe
ſimiles iuxta definit.
11. Quoniam ergo vtraque prædicta ſolida
11Defin. 7. ſunt ſimilia, erunt baſes, LH, XY, ſimiles, ducantur earum oppo-
ſitę
tangentes, quę ſint homologarum regulę, ipſę, LD, HG, X f,
22Coroll. 1.49[Figure 49] Y l, quarum, &
prædictarum ſimi-
33B. Def. 10. lium figurarum incidentes ſint ipſæ,
DG
, f l, quæ etiam pro regulis alia-
44Coroll.
23
.
rum homologarum ſumi poterunt,
ſint
ergo duę quæcunque homologę
parallelę
incidentibus, D G, fl, ip-
ſæ
, LH, XY, ſi ergo per has, &
la-
55Defin. 7. tera cylindricorum, vel conicorum
iam
dictorum extendantur plana, ab
ijs
producentur in cylindricis ſimilia
parallelogramma
, &
in conicis ſimi-
lia
triangula, quę etiam erunt ad ba-
ſes
æquè ad eandem partem inclina-
ta
.
Extendantur ergo per oppoſitas
tangentes
, LD, HG;
Xf, Yl, pla-
na
tangentia tam cylindricos, quam
conicos
iam dictos, &
hęc ſimul cum
planis
baſium indefinitè producan-
tur
ad partes incidentium, DG, fl,
&
tandem per, DG, fl, cum ſint
parallelæ
, extendantur plana ipſis,
AH
, KY, parallela ſecantia iam pro-
ducta
plana in rectis, DG, GE, E
B
, BD, DE, fl, l &
, & Z, Zf, f
66Defin. 13.
vndec
. El.
&
, erunt ergo parallelepipeda, AG,
Kl
, &
priſmata, LNGD, XVlf,
7724. Vnd.
Elem
.
ergo erit parallelogrammum, BG,
ſimile
ipſi, AH, &
, Zl, ſimile, K
Y
, quæ cum ſint inter ſe ſimilia, e-
tiam
, BG, Zl, erunt ſimilia, ſic e-
tiam
oſtendemus triangula, EDG,
&
fl, eſſe ſimilia, ſub intellige iuxta
definitionem
Euclidis, ergo erunt e-
tiam
ſimilia iuxta defin.
10. Ducantur duo plana oppoſitis tangenti-
8827. huius. bus intermedia, ac parallela, altitudines dictorum ſolidorum reipectu
baſium
, LH, XY, ſumptas, ſimiliter ad eandem partem

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