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

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153133LIBER II. ac voluntas, pulchras demonſtrationes etſi difficiles, ac longas infracto
quodam
animi vigore ſuperandi, potius quam ab ipſis ſuperari velint.
Poterat quidem in plures Propoſitiones commodius diſtribui, ſed cum-
illæ
omnes in hanc ſimpliciſſimam eſſent conſpiraturæ, eas omnes ſub
hac
vna Propoſit.
colligaui, quamtamen in Sectiones ceu in tot mem-
bra
distinguere placuit, ne Lectoris mens nimium defatigaretur.
Porrò
quanti
hæc Propoſitio ſit momenti, ſicut &
præcedens Propoſ. 15. atten-
ta
præcipuè earum vniuerſalitate, neminem, qui eaſdem intellex erit,
fore
puto, qui itidem non agnoſcat;
quid enim fuit, quo ad figuras pla-
nas
, Euclidem lib.
6. Elementorum in Propoſ 19. demonſtraſſe ſimilia-
triangula
, &
in Propoſ. 20. ſimilia Polygona eſſe in dupla ratione la-
te
um homologorum, necnon lib.
12. Propoſ. 2. Circulos eſſe, vt diame-
trorum
quadrata, hoc eſt in dupla ratione diametrorum?
Similiter in eo,
quod
ſpectat ad ſolida, quid fuit ipſum nobis in lib.
12. Propoſ. 8. oſten-
diſſe
ſimiles Pyramides eſſe in tripla ratione laterum homologorum, &

in
Prop.
12. ſimiles conos, & cylindros eſſe in triplaratione diametro-
rum
quæ ſunt in baſibus, &
in Propoſ. 18. Sphæras itidem eſſe in tri-
pla
proportione diametrorum?
Quid tandem fuit alios quoq; demonſtraſ-
ſe
, quædam alia ſimilia ſolida, vt portiones Sphærarum, necnon Sphæ-
roidearum
, &
Conoide arum figurarum, eſſe in tripla ratione linearum,
vel
laterum homologorum?
Præ huius comparatione, quod in his duabus
tantum
Propoſitionibus edocemur;
omnes . n. ſimiles figuras planas in
Prop
.
15. & omnes ſolidas in ſubſequenti Propoſ. 17. comprebendimus,
quod
mebercle conſideratione dignum videtur.

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