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

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210190GEOMETRI Æ
COROLLARIVM.
_H_Inc patet cubùm totius, AC, æquari parallelepipedis ſub ſingulis
partibus i pſius, AC, &
ſingulis partibus quadrati, AC, quod
etiam patet ex Theoremate 35.
THEOREMA XXXVIII. PROPOS. XXXVIII.
SI recta linea in vno puncto ſecta ſit vtcumq; cubus totius
æquatur cubis partium, vna cum parallel@ pipedis rer
ſub qualibet partium, &
quadrato reliquæ. Vel æquatur
cubis partium vna cum tribus parallelepipedis, ſub tota, &

eiuſdem partibus contentis.
Sit recta linea, AC, vtcumque ſecta in puncto, B. Dico cubum,
AC, æquari cubis, AB, BC, &
parallelepipedis ter ſub, AB, &
quadrato, BC, &
ter ſub, BC, & quadrato, AB. Nam parallele-
pipedum ſub, AC, &
quadrato, AC, (qui eſt cubus, AC,) æqua-
11ExCorol.
ant. vel ex
35. huius.
tur parallelepipedis ſub ſingulis partibus ipſius, AC, &
ſub ſingulis
partibus quadrati, AC, ab hac diuiſione prouenientibus, ideſt pa-
rallelepipedo ſub, AB, &
quadrato, AB, qui eſt cubus, AB, item
ſub, AB, &
quadrato, BC, item ſub, AB, & rectangulo, ABC, bis,
2236. huius.
Pars I.
ideſt ſub, CB, &
quadrato, BA, bis ſumpto, habemus ergo vnum
126[Figure 126] cubum, AB, vnum parallelepipedum ſub,
AB, &
quadrato, BC, & duo ſub, BC, &
quadrato, BA;
tranſeamus nunc ad aliam
partem, BC, remanent ergo parallelepipe.
da ſub, BC, & quadrato, BC, ideſt vnus cubus, BC, item ſub, C
B, &
quadrato, AB, & tandem ſub, CB, & rectangulo, CBA, bis,
ideſt ſub, AB, &
quadrato, BC, bis, ſi igitur hæc poſteriora pa-
3330. huius.
Pars I.
rallelepipeda prioribus iunxeris habebis cubum, AB, cubum, BC,
parallelepipedum ter ſub, AB, &
quadrato, BC, & ter ſub, BC, &
quadrato, BA, quibus æquale erit parallelepipedum ſub, CA, &

quadrato, CA, ideſt cubus, CA.
Quia verò parallelepipedum ſub,
CB, &
quadrato, BA, ideſt ſub, AB, & rectangulo, ABC, cum
parallelepipedo ſub, AB, &
quadrato, BC, ideſt ſub, CB, & re-
ctangulo, ABC, æquatur, ex 35.
huius, parallelepipedo ſub tota,
AC, &
rectangulo ſub partibus, AB, BC, ideò dicta ſex parallelepi-
peda tribus ſub tota, AC, &
partibus eiuidem, AB, BC, æqualia
crunt, quod demonſtrare propoſitum fuit.

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