Cavalieri, Buonaventura
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Geometria indivisibilibvs continvorvm : noua quadam ratione promota
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GEOMETRIÆ
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perſiciei dictum ſolidum ambientis, quia gitur, B, non eſt in commu-
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ni ſectione iam dicta, & </
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<
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xml:space
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">eſt in plano figuræ, ACDFG, igitur erit
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intra, vel extra ſuperficiem ambientem dictum ſolidum, eſt autem in
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ambitu figuræ, quæ tali ambitu dictam ſuperficiem deſcribit, ergo
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erit in ipſa ſuperficie ambiente, & </
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<
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xml:space
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">non erit, quod eſt abſurdum, non
<
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igitur aliquis punctus ambitus figuræ, quæ dictam ſolidum per reuo-
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lutionem generat eſt extra ambitum figuræ, ACDFG, igitur iſti
<
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ambitus, & </
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<
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">conſequenter ipſæ figuræ ſibi inuicem congruunt, & </
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<
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vna figura, ea ſcilicet, quæ per reuolutionem dictum ſolidum rotun-
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dum generat, quod erat demonſtrandum.</
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<
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">SI ſolidum rotũdum ſecetur plano ad axem recto, fiet con-
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cepta in ipſo figura circulus, cuius centrum erit in axe.</
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</
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<
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<
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">Sit ſolidum rotundum, cuius axis, AC, & </
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<
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xml:space
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">figura, quæ ipſum per
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reuolut onem genuit ipſa, ABCD, ſecetur autem plano ad axem
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recto, ex quo in ipſo producatur figura, MBND. </
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<
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circulum, cuius centrum erit in axe, vt, E, ſit autem communis ſe-
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ctio plani recti ad axem, & </
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<
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">figuræ, ABCD, recta, BD, quia er-
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go figura, ABCD, eſt circa axem, ipſa autem, BD, quæ rectè a-
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xim ſecat, vna eſt ex ordinatim ad ipſam
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axim applicatis, ideò ab ea bifariam diui-
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ditur in puncto, E, ducatur nunc aliud pla-
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num per axem, quod in dicto ſolido pro-
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ducat figuram, AMCN, quæ ſecet figu-
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ram, MBND, in recta, MN, erit ergo
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hæc figura eadem ei, quæ per reuolutio-
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nem dictum genuit ſolidum, & </
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<
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gura circa axem, ad quam ordinatim ap-
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plicatur, MN, cum ipſa rectè axem, AC,
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diu dat, ergo, MN, bifariam diuiditur in,
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E, eodem pacto quaſcumq; </
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<
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xml:space
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nes ſectiones figurarum per axem, AC,
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tranſeuntium, & </
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demus bifariam diuidi in, E. </
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<
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CN, ſunt eædem illi, quæ per reuolutionem generat ſolidum, AB
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CD, &</
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<
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">, BD, MN, tranſeunt per idem punctum axis, AC, rectè
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eundem ſecantes, ideo ſi ipſa, AMCN, reuolueretur, donec eſſet
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in plano figurę, ABCD, illi congrueret, &</
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<
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de, MN, BD, ſunt æquales, & </
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<
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