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

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280260GEOMETRIÆ nicum, EDP, eſſe ſubduplum portionis ſphæræ, vel ſphæroidis, D
EP;
hæc autem etiam ab alijs oſteniſa ſunt. Verum ſi ſiguræ ſimiles
172[Figure 172] iam dictæ non ſint circuli, vel elli-
pſes, ſed aliæ vtcunque figuræ, vt
ex.
g. quadrata, veluti in figuris in
tra ellipſes exemplificare volu, dia
metros homologas in figuris gen -
tricibus habentia, adhuc eædem
rationes ſupradictis erunt inter hęc
ſolida ad inuicem ſimilaria genita
ex, FP, &
portione, DEP, ſiue
ex triangulo, EDP, &
portione,
DEP, baſes habentia quadratas;
patet autem hic, quod ſolidum ſi-
milare genitum ex, FP, baſem ha-
bens rectilineam, ſicuti eſt priſma,
ita &
hoc nomine vocari poteſt
magis particulari, veluti &
ſoli-
dum ſimilare genitum ex triangu-
lo, EDP, nomine piramidis vo-
cari poteſt, dum baſim habet recti-
lineam.
Deniq; vniuerſaliſſimè habetur
ratio quorumcumque duorum ſo-
lidorum genitorum ex, FP, &
por-
tione, DEP, ſiue ex triangulo, D
EP, &
portione, DEP, iuxta re-
gulam, DP, quacunque in ſimili-
bus figuris variatione facta.
Quæ
autem in huius Theorematis decla-
ratione animaduerſa ſunt, memo-
ria teneantur, nam &
ſequentia
conſimili methodo, ſed breuiori
declarabimus;
ſuſſiciat autem tot
figurarũ variationes in duabus tan-
tum exemplificaſſe, quas ſolido-
rum indicant baſes, nempè circu-
lus, &
quadratum, inſcriptum ei-
dem circulo, habens vtrunq;
dia-
metrum in figura genitrice, impo-
ſterum enim cuin ſine figurarum
confuſione id ægrè ſieri poſſit vna tantum poſitione contenti

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