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

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490472GEOMETRIÆ diametro circuli, vel ellipſis, quæ reuoluitur, eſſe æqualem dicto anu-
11_Coro. 13._
_34. l. 3._
lo ſtricto.
Conſimiliter autem inueniemus cylindrum æqualem anulo
lato circulari, vel elliptico;
& eius portionibus, abſciſſis planis ad
axem reuolutionis rectis;
ſiue cuicunq; ex figuris Corollariorum 26.
27. 28. 29. Lib. 3. Similiter inueniemus cylindrum æqualem Malo
Roſeo, vel Cotoneo, vel Citri@, vel Oliuæ;
Conoidi Parabolico, Vel
hyperbolico, eiuſdem fruſto, Apici parabolico, Semianulo ſtricto, vel
lato, &
ſemibaſibus ſtrictis, medijs, vel latis, Aceruis minori, vel
maiori parabolicis.
Tympano hyperbolico, & portionibus eorundẽ
ſupra conſideratis, &
cylindricis, vel conicis, qui in baſibus ſpatijs
ſub ſpiralibus, &
volutis conſtituuntur. Triplicatis autem altitu-
dinibus inuentorum cylindrorum, in quibus, &
eiſdem baſibus cum
cylindris, conſtituantur coni, iſti prædictis ſolidis æquales erunt, &

iuxta Coroll.
_1_ antecedentis inueniemus pariter cylindrum, vel co-
num, qui ad quoduis ex prædictis ſolidis datam ratione mhabeat.
PROBLEMA III. PROPOS. XXVI.
SPhæram inuenire æqualem dato cylindro. Similiter, &
ſphæroidem circa datum axim æqualem dato cyin-
dro -
Sit cylindrus datus, A, oportet illi æqualem ſphæram inuenire.
Fiat cylindrus rectus, CFD, ſexquialter cylindri, A, deinde inter,
22Vide Da-
uidem Ri
ualtum in
Commé.
in Arch.
ad prop.
1. ſecundi
de Sphæ-
ra, & Cy-
lindro.
332[Figure 332] altitudinem, FE, &

baſis diametrũ, CD,
duæ mediæ continuè
proportionales, iuxta
methodũ ab alijs tra-
ditam, inueniantur,
quę ſint, M, GH, de-
ſcripto autem circu-
lo circa alterà dictarũ
mediarum tanquam
diametrum, vt circa,
GH, fiat is baſis cu-
uſdam cylindri altitu-
dinis æqualis ipſi, G
H, &
ſit tandem ſphæra, B, circa diametrum æqualem ipſi, GH,
conſt tuta.
Dico ſphæram, B, eſſe æqualem cylindro, A. Eſt en@m
CD, ad, GH, vt, M, ad, FF, permutando, CD, ad, M, eſt vt,

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