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

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367347LIBER IV. CI, & ſic eſſe quodlibet ſolidum ſimilare genitũ ex parabola, FCH,
ad ſibi ſimilare genitum ex parabola OCM, iuxta communem re-
gulam, FH, ſiue CG, ſit axis, ſiue tantum diameter, quod iuxta an-
tecedentis explicationem facilè intelligi poteſt.
COROLLARIVM III.
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-
rò 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.
COROLLARIVM IV.
IN Propoſ. 26. veluti oſtendimus in eiuſdem figura hic appoſita
250[Figure 250] omnia quadrata portionis, BSF,
ad rectangula ſub portione, BSF, &

figura diſtantiarum, SEF, eſſe vt, BF,
ad FE, ſic oſtenſum fuiſſet (aſſumptis
vice quadratorum alijs figuris ſimili-
bus, &
vice rectangulorum, aſſumptis
alijs ſimilibus figuris eius generis, vt
veluti eſt vnum quoduis dictorum
omnium quadratorum ad rectãgulum adiacens lateri, à quo deſcri-
bitur, ita ſit figura ab eodem latere deſcripta vice quadrati ſumpta,
ad figuram deſcriptam eodem latere vice rectanguli ſumptam,

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