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

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242222GEOMETRIÆ ſemicirculi, vel ſemiellipſis, FQB, eſſe vt quadratum, DB, ad re-
ctangulum
ſub, DB, BR, quoniam rectanguſa ſub, FD, &
ſemi-
circulo
, vel ſemiellipſi, FQB, ſunt maiora omnibus quadratis ſemi-
circuli
, vel ſemiellipſis, FQB, ideò etiam rectangulum ſub, DB, B
E
, ſemper maius eſt rectangulo ſub, DB, BR, &
ideo punctum, R,
ſemper
cadet inter punctum, B, &
punctum, E, quocunque deinde
cadat
punctum, I, vnde patet, &
c.
Similiter, quia omnia quadrata ſemicirculi, vel ſemiellipſis, FQ
B
, vna cum rectangulis ſub eodem, &
ſub quadrilineo, FQBDZ,
bis
ſumptis, minora ſunt omnibus quadratis, FD, ideò, BV, com-
pofita
ex tribus, BR, RE, EV, minor eſt ipſa, BD, nam, DB, ad,
BV
, eſt, vt omnia quadrata, FD, ad compoſitum ex omnibus quadra-
tis
ſemicirculi, vel ſemiellipſis, FQB, &
ex rectangulis ſub eodem, &
ſub
quadrilineo, FQBDZ, bis ſumptis, vnde omnia clarè patent.
_H_INC habetur omnia quadrata, FD, ad reliquum ſui, demptis
omnibus
quadratis quadrilinei, FQBDZ, eſſe, vt, DB, ad, BV.

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