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

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3010GEOMETRIÆ deinde inter eadem plana tangentia eiſdem æquidiſtantia
11D. Def.2. vtcumque plana ducta fuerint, altitudines ſolidorum, re-
ſpectu
dictorum tangentium ſumptas, ſimiliter ad eandem
partem
diuidentia, reperiamus figuras exhis planis in di-
22A.Def.10. ctis ſolidis conceptas eſſe ſimiles, vel ſi plures producan-
tur
, tot numero in vno, quot in alio ſolido produci, quæ
33E.Def.10. fint binæ ſimiles, &
quæ ſunt vnius ſolidi ſimiliter inter ſe
diſpoſitę
, ac quę ſunt alterius, &
omnium homologas dua-
bus
quibuſdam rectis lineis communiter, tamquam earum-
dem
regulis, æquidiſtare.
(ſic. n. earum homologæ cum
quibuſuis
alijs duabus regulis angulos æquales cum præ-
dictis
facientibus, vt infra Prop.
23. huius oſtendetur, e-
tiam
haberi poterunt) Vnde ſiregulæ homologarum acci-
piantur
cum incidentibus planis concurrentes, &
conce-
ptarum
in ſolidis ſimilium figurarum ductæ in ſingulis op-
poſitæ
tangentes præfatis regulis Parallelę producantur, ſt
opus
ſit, quouſq;
prædictis incidentibus planis occurrant,
&
binarum quarumcumque oppoſitarum tangentium pun-
cta
occurſuum iungantur rectis lineis, etiam has iungentes
reperiamus
ſingulas eſſe incidentes ſuarum ſimilium figu-
rarum
, &
oppoſitarum tangentium, ac omnes dictas inci-
dentes
concipi in figuris ſimilibus, quarum, &
ipſæ inci-
dentes
ſint homologæ, &
omnium regulæ communes ſe-
ctiones
planorum incidentium, &
oppoſitorum planorum
tangentium
.
Has omnes, inquam, conditiones ſimilia ſo-
lida
in vniuerſum habere ſuppono.

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