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

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235215LIBER III. quorum latera ſint prædictis diametris parallela, quæ ideò ſunt æquian-
gula, vniuerſaliter igitur prædicta ſunt iter ſe, vt parallelogramna re-
ctangula, vel æquiangula illis circumſcripta;
Vnde etiam habetur pa-
rallelogramma rectangula illis circumſcripta eſſe, vt parallelogramma
æquiangula pariter illis circumſcripta.
COROLL II. A. SECTIO I.
11A.
_H_INC vlterius colligitur, quod quæcunque de binis parallelo-
grammis oſtenſa ſunt in Theorem.
5. 6. 7. 8. lib 2. præſuppoſitis
conditionibus illic conſideratis circa eorum baſes, &
altitudines, vel
circa eorum latera, eadem &
de ellipſibus verificabuntur eaſdem con-
ditiones in proprijs axibus, vel diametris habentibus;
nam his poſitis
parallelogrammaillis circumſcripta, &
æquiangula habent in ſuis la-
teribus, vel in baſi, &
altitudine eaſdem conditiones, vnde ſicuti di-
ctæ concluſiones ſequuntur pro parallelogrammis circumſcriptis, ita
etiam verificantur pro inſcriptis ellipſibus, ad quas dicta parallelo-
gramma habent eaſdem rationes, vt probatum eſt, quæ igitur hic non
22_11. Huius._ ſunt pro ellipſibus ad inuicem comparatis oſtenſa, per ſupracitata
Theoremata ſupplentur, pro circulis autem hoc tantum habemus, quod
ſint, vt eorum axium, vel (ſimanis dicere) diametrorum quadrata,
non aliaque circa eoſdem variatio contingit.
B. SECTIO II.
33B.
_C_olliguntur ergo hæc de binis ellipſibus . ſ. quod quæ ſunt circa ean.
dem diametrum, ſunt vt reliquæ ſecundæ diametri.
C. SECTIO III.
44C.
_Q_V æcunq; ellipſes habent rationem ex axibus, vel diametris con-
iugatis, æqualiter ad inuicem inclinatis compoſitam.
D. SECTIO IV.
55D.
_E_Llipſes habentes axes, vel diametros coniugatas, quæ æqualiter
ſunt inclinatæ, reciprocè reſpondentes, ſunt æquales;
& quæ
ſunt æquales, &
habent axes, vel diametros ad inuicem æqualiter in-
clinatas, eaſdem habent reciprocè reſpondentes.

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