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

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496476GEO METRIÆ dicto anulo @tricto) cui adijciatur in directum, HI, ipſi, DC, æqua
lis, deinde tota, FI, bifariam diuidatur in, G, &
producta, DC,
verſus, C, indefinitè in ea ſumatur, AD, æqualis ipſi, GI, &
ab-
ſciſla ab eadem ad punctum, A, ipſa, AR, eidem, CD, ęquali, in-
telligatur circa, AR, diametrum deſcriptus circulus, AR, ęqualis,
335[Figure 335] CD.
Dico anulũ
latum circularem
deſcriptum per, A
R, reuolutum cir-
ca, MN, in tali ſi-
tu, cylindro, E, ę-
qualem eſſe.
Nam
ſtrictus anulus de-
ſeriptus à, CD, ad
cylindrum, E, eſt
vt, DC, ad, FH, &

quia, GI, eſt æqualis ipſi, AD, &
, CD, ipſi, HI, erit, GH, æqualis
ipſi, AC, ergo vt, DC, ad, FH, ita eſt eadem, DC, ad, IGH, vel ad,
DAC, ſiue, AR, ad, ADR, (nam compoſita ex, AD, DR, eſt æ-
11Elicitur ex
dictis in
Corol. 29.
34. lib. 3.
Sect. 2. fi
ea circulis
applicẽtur.
qualis compoſitæ ex, DA, AC,) eſt autem vt, AR, ad compoſitã
ex, AD, DR, ita anulus ſtrictus genitus ex circulo, CD, ad anu lũ
latum genitum ex circulo, AR, ergo anulus ſtrictus genitus ex cir-
culo, CD, ad anulum latum genitum ex circulo, AR, erit, vt idem
anulus ſtrictus ad cylindrum, E, ergo anulus latus genitus ex circu-
lo dato, AR, ſiue, CD, in tali ſitu, æqualis erit cylindro, E.
In-
uentum ergo eſt, quod opus erat.
COROLL ARIVM I.
_I_Vxta Coroll. autem Prop. 26. huius, manifeſtum eſt nos etiam di-
ctos anulos in dataratione ad datum cylindrum inuenire poſſe, &

ſubinde etiam in data ratione ad quodcunq;
ex ſolidis in Sect. 3. Cor. 2.
Prop. 25. huius enumeratis.
COROLL ARIVM II.
_H_Abetur injuper ſi in recta, DA, indefinitè producta, continuen-
tur à puncto, D, æquales circulorum diametri;
ab eiſdem cir-
@ulis per reuolutionem circa, MN, deinceps genitos anulos ſeſe ha-
bere, vt numeros impares ab vnitate continuò progredientes.
Quod
ſi in eadem recta linea perpendiculari ipſi, MN, Vt in eadem, DA,

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