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

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IN Prop. 21. ergo ſi intelligantur tres figuræ, nempè parallelo-
grammum
, AF, triangulus, EVF, &
parabola, VEF, circa com-
247[Figure 247] munem axem reuolui, qui ſuppona-
tur
eſſe, EM, fiet ex, AF, cylindrus,
AF
.
extriangulo, VEF, conus, VEF,
&
ex parabola, VEF, conoides para-
bolicum
, VEF, vnde patebit cylindrũ,
AF
, eſſe duplum conoidis, VEF, &

hoc
eſſe ſexquialterum coni, VEF;
&
vniuerſaliſsimè
, vt dictum eſt, ſoli-
dum
ſimilare genitum ex, AF, ad ſibi
ſimilare
genitum ex parabola, VEF, habere duplam rationem, hoc
verò
ad ſibi ſimilare gentium ex triangulo, VEF, rationem ſexqui-
alteram
, quod tamen, ne figuræ multiplicentur, ſeu nimis confun-
dantur
(quod etiã impofteru obſeruabimus) vno tãtũ adhibito exẽ-
plo
, reuolutionis figurarũ genitriciũ circa ſuos axes, explicare volui.
IN Prop. 22. aſſumpta eius figura, fiat exemplum per reuolutio-
248[Figure 248] nem parabolæ, FCH, circa axẽ,
CG
, dimiſsis parallelogrammis, AH,
RM
, fient igitur in hac reuolutione
conoidea
parabolica ex, FCH, OCM,
parabolis
, quæ fint, FCH, OCM;
vn-
de
patebit conoides parabolicum,
FCH
, ad conoides parabolicũ, OCM,
eſſe
, vt quadratũ, GG, ad

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