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

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IN Prop. 23. aſſumpta figura Prop. 12. ſcilicet parabola, BNH,
parallelogrammis
, PH, AG, &
triangulo, BRH, reuoluatur pa-
249[Figure 249] rabola, BNH, vt fiat noſſrum exem-
plum
, circa axem, NO, &
inſimul, PH,
AG
, &
triangulus, BRH, circa RO,
patebit
ergo cylindrum ex, PO, ad
fruſtum
conoidis ex, ABOR, in reuo-
lutione
genitum, eſſe vt, ON, ad com-
poſitam
ex, NR, &
{1/2}. RO, ipſum ve-
ad idem dempto cylindro ex, AO,
.
ſ. AG, vt, NO, ad {1/2}. RO, ex Corollario huic Propoſitioni ſubiecto,
hoc
fruſtum tandem ad conum gentium ex triangulo, RBO, vt cõ-
poſita
ex, ON, dupla, MR, &
{1/2}. RO, adipſam, NO; & vniuerſa-
liter
quæcunque ſolida ſimilaria ex eiſdem figuris genitricibus geni-
ta
, iuxta communem regulam, BH, eaſdem rationes habere, vt ſu-
pradicta
ad inuicem comparata, ſiue, NO, ſit axis, ſiue tantum dia-
meter
;
quod ex Propol. 51. clarè patet. Intelligatur autem in ſe-
quentibus
, licet ſemper aſſumatur axis, tamen pro ſolidis ſimilari-
bus
etiam aſſu mptis diametris eadem ibi appoſita verificari.

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