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

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page |< < (53) of 569 > >|
7353LIBER I. poſſemus habere, quot ſunt variationes inclinationum diametrorum
ad
baſes, quam tamen variationem per definitionem ſupradictam
excludere
neceſſarium eſſe exiſtimaui.
Suppoſito igitur, quod tali
definitioni
hoc adiungatur, dico eam cum mea concordare, ſi pro
36[Figure 36] ipſis ſectionibus tanquam figuris in-
telligatur
.
Ductis enim per vertices,
A
, R, baſibus, DF, QK, paralle-
lis
, illæ tangent dictas portiones, &

inter
eaſdem ductas habebimus ip-
ſas
, AE, RG, illis ad eundem an-
gulum
incidentes ex eadem parte,
quibus
ſimiliter ad eandem partem
diuiſis
, vt in punctis, N, O;
V, X;
& per eadem ductis ipſis tangenti-
bus
parallelis, BM, CH, SP, TL,
inuenimus
eas, quęinter ipſas, AE,
RG
, &
circuitum figurarum, ADF, RQK, ad eandem partem
continentur
, &
diuidunt ipſas ſimiliter ad eandem partem, eodem
ordine
ſumptas, eſſe in proportione ipſarum, AE, RG, nam quia,
DF
, ad, EA, eſt vt, QK, ad, GR, permutando, DF, ad, QK,
erit
vt, EA, ad, GR, &
quia ipſæ, AE, RG, ſunt diametri, ad
quas
ordinatim applicantur dictæ parallelę, ideò ab eiſdem bifariam
diuidentur
, ergo, &
, DE, ad, QG, & , EF, ad, GK, erit vt, E
A
, ad GR, eodem modo oſtendemus tum, CO, ad, TX, tum, O
H
, ad, XL, eſſe vt, OA, ad, XR .
i. vt, EA, ad, GR, & ſic, B
N
, ad, SV, &
, NM, ad, VP, eſſe vt, NA, ad, VR . i. vt, EA,
ad
, GR, ſunt igitur figurę, ADF, RQK, ſimiles iuxta meam de-
11Defin.10. finitionem, earum verò, &
tangentium oppoſitarum (quarum duæ
ex
vna parte ſuntipſæ, DF, QK,) incidentes ſunt ipſæ, AE, RG.

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