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

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11494GEOMETRIÆ lineis, vel lateribus homologis deſcriptarum figurarum; ſolida, in qui-
bus
deſcriptæ figuræ ex traiectis planis producentur (quæ in ſequenti li-
bro
dicuntur, ſolida ad inuicem ſimilaria genita ex dictis ſectionum por-
tionibus
) erunt ſimilia, &
figurarum homologarum eorundem regulæ
11_C. Def. 8._
_lib
. 2._
oppoſita tangentia plana dictis iam deſcriptis figuris æquidiſtantia, quo-
rum
&
dictorum ſolidorum figuræ incidentes erunt dictæ ſectionum por-
tiones
, vel in earum planis iacebunt.
V nde colligimus omnes ſphæras
eſſe
ſimiles, nam ſi ſecentur planis per axem, conceptæ figuræ fiunt ſimi-
les
, ideſt circuli, quod ſi ſecentur adhuc planis ad horum circulorum pla-
22_Lẽma 31._
_huius
pr._
na erectis, productæ figuræ fiunt pariter circuli deſcripti tanquam dia-
metris
eiſdem rectis lineis, in quibus coincidunt circulis per axem du-
33_33. huius._ ctis, quæ diametri ſunt etiam incidentes eorundem deſcriptorum circu-
44_34. huius._ lorum, &
oppoſitarum tangentium per eorum extrema ductarum, quæ
55_Lẽma 31._
_huius
._
tangentes omnes inter ſe æquidiſtant, vt facilè patet, &
ſunt iſtæ inci-
dentes
, ſiue diametri deſcriptorum circulorum, quæ axem diuidunt fi-
militer
ad eandem partem, vt ipſi axes, igitur ſpbæræ omnes ſunt ſimi-
les
, &
ductis duobus planis oppoſitis tangentibus vtcumq; & per axem,
66_Lẽma 31._
_huius
._
qui iungit puncta contactuum ductis planis, hinc effecti circuli erunt
figuræ
incidentes dictorum tangentium, &
ſphærarum, & dicta plana
tangentia
erunt regulæ homologarum figurarum earundem, vnde tan-
dem
patet quoſuis circulos in ſphæris per centrum tranſeuntes poſſe eſſe
figuras
incidentes earundem ſphærarum, &
planorum oppoſitorum tan-
gentium
ſphæras in extremis punctis diametrorum quorumuis dictorum
circulorum
per centrum tr anſeuntium.

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