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

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266GEOMETRIÆ
IX.
SImiles portiones ſpherarum, vel ſpęroidum, & ſimiles
Conoides, ſiue Conoidum portiones appellabimus,
quando per axes ductis planis ad rectos angulos baſibus
conceptę in eiſdem ſolidis figurę ſimiles erunt (iuxta de-
finit.
10. ſubſequentem, vel etiam iuxta aliorum definitio-
nes de ſimilibus figuris planis allatas, ſubintellige) qua-
rum, &
baſium communes ſectiones ſint homologe baſium
diametri, quę vel circuliſint, vel ſimiles ellipſes.
SCHOLIVM.
_C_Aetræ d finitiones ab Euclide ſimilium planarum figurarum,
&
ſolidarum, & ſimilium Cylindrorum, & Conorum, & quæ
ab Apollonio lib.
6. Conicorum, referente Eutocio, fiunt ſimilium ſe-
ctionum Coniportionum, ſumantur, vt abipſis afferuntur, adtuncto
tamen definitioni ſimilium ſectionum Coni portionum ibidem ab Apol-
lonio allatæ, ſi pro ſpatijs vſurpetur quam infr a dicetur.
A. X.
11A
SImiles figurę planę in vniuerſum vocentur, in quarum
ſingulis oppoſitę tangentes ita duci poſlunt, &
in eaſ-
dem tangentes ita incidere ad eundem angulum, ex eadem
parte rectę lineæ in illis terminatę, vt, ſi intra dictas op-
poſitas tangentes eiſdem æquidiſtantes vtcumq;
ductę fue
rint rectę lineæ, eas, quę incidunt dictis tangentibus, ſimi-
liter ad eandem partem ſecantes;
reperiamus harum paral-
lelarum, nec non &
oppoſitarum tangentium eas portiones,
quę inter dictas incidentes, &
circuitus figurarum ad ean-
dem partem ſitę funt, eodem ordine ſumptas, eandem inter
ſe rationem habere, quam rectæ lineæ, quę dictis tangenti-
bus inciderunt, &
in eaſdem terminantur.
B.
22B
IPſę autem quę dictis tangentibus incidunt, & in easter-
minantur, dicentur;
Incidentes dictarum tangentium
oppoſitarum, &
figurarum.

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