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

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372352GEOMETRIÆ ſolida, BAE, ad conoidem parabolicam, ACE, vt quadratum, MO,
cum rectangulo bis ſub, MOC, ad quadratum, MC, ergo, ex æqua-
li, portio ſolida, ABE, ad portionem ſolidam, BDE, erit vt qua-
dratum, MO, cum rectangulo bis ſub, MOC, ad quad.
ON, cum re-
ctang.
bis ſub, ONC, quod & c.
Sed vniuerſaliter ſi ſint ſolida ſimilaria genita ex parabolis, ACE,
BCD, iuxta communem regulam, AE, &
ducatur planum per, BE,
rectum plano parabolæ, ACE, ſcindens ſolidum ſimilare genitum
ex, BDEA, in duas portiones ſolidas, BAE, BDE, adhuc, conſe-
quenter ſupradictis, inueniemus has duas portiones ſolidas eſſe in
eadem ratione, vt portiones ſolidæ productæ ex ſectione fruſti co-
noidis parabolicæ, BAED, .
ſ. eſſe vt quadratum, MO, cum rectan-
gulo bis ſub, MOC, ad quadrat, ũON, cum rectangulo bis ſub, ONC,
quod ex ſupradictis erui facilè poteſt;
quæ demonſtratio currit etiã,
ſi, CM, non ſit axis, ſed tantum diameter, vt confideranti clarè
patebit.
A. COROLL. VII. SECTIO I.
11A.
IN Prop. 29. & Cor. Sect. 1. & 2. colligimus ſolida ſimilaria geni-
ta ex parabolis in eadem altitudine conſtitutis, genita inquam
iuxta regulas ipſarum baſes, eſſe inter ſe, vt quadrata baſium, &
in
ijſdem baſibus conſtitutis, vt earum altitudines, vel vt diametros
æqualiter baſibus inclinatas;
hoc igitur nedum concluditur de co-
noidibus parabolicis in eadem altitudine ſtantibus, quod ſit, vt qua-
drata baſium, vel in eadem baſi exiſtentium, quod ſint, vt altitu-
dines, ſed de cæteris ſimilaribus ſolidis ex ipſis parabolis genitis
iuxta regulas baſes, vt dictum eſt.
B. SECTIO II.
22B.
ITem habemus conoides parabolicas, & cætera ſolida ſimilaria
ex parabolis genita iuxta regulas baſes, habere inter ſe ratio-
nem eompoſitam ex ratione quadratorum baſium, &
altitudi-
num, vel diametrorum æqualiter baſibus inclinatarum.
C. SECTIO III.
33C.
ITem eadem ſolida, quarum baſes altitudinibus, vel diametris
æqualiter baſibus inclinatis reciprocantur, eſſe æqualia, &

quæ ſunt æqualia habere baſes altitudinibus, vel diametris æqua-
liter baſibus inclinatis, reciprocas.

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