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

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THEOREMA XIX. PROPOS. XXII.
Vtamuradhuc figura Propoſ. 19. & ſint duæ figuræ planæ quæ-
cumque
ſimiles, inæquales, &
ſimiliter poſitę, non tamen exiſten-
tesin
eodem plano, ipſæ, VBO, TDF.
Dico, quod erunt am-
cuiuſdam fruſti conici oppoſitę baſes.
Quoniam ergo figure, V
BO
, TDF, ſunt ſimiliter poſitæ, &
non in eodem plano, erunt in
11D.Def.0.
huius
.
planis ęquidiſtantibus, &
quia ſunt ſimiles ſint earum incldentes, &
oppoſitarum
tangentium, quæ ſunt earundem homologarum regu-
, ipſæ, KN, HP;
KN, ipſius, VBO, & , HP, ipſius, TDF,
&
prædictæ tangentes figuræ, VBO, ſint ipſæ, VK, XN, & fi-
guræ
, TDF, ipſæ, TH, SP, erunt ergo ipſæ, KN, HP, æqui-
diſtantes
, &
quia ad tangentes, quæ ſunt regulæ homologarum, illę
22Conuerla
10
. Vnde-
cimi
El
efficiunt ad eandem partem angulos æquales, erit angulus, KNX,
æqualis
angulo, HPS, &
quia, KN, eſt parallela ipſi, HP, erit
etiam
, XN, parallela ipſi, SP.
Eodem pacto oſtendemus, VK,
eſſe
parallelam ipſi, TH;
ducantur in figuris, VBO, TDF, duæ
earum
homologæ regulis dictis tang entibus, quæ ſint ipſæ, BR, I
O
, DC, EF, ſint autem totæ, BO, DF, productæ, ſi opus ſit, vt
ſecent
ipſas, KN, HP, quas diuident ſimiliter ad eandem partem,
vt
in punctis, M, G, &
quia figuræ propoſitæ ſunt inæquales, ſit
maior
ipſa, TDF, igitur etiam maior erit, DC, ipſa, BR, vel, E
F
, ipſa, IO, ſi, n.
eſſent eiſdem æquales, etiam reliquæ homologæ
his
parallelæ eſſent ęquales, cum omnes ſint proportionales (ſunt.
n.

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