Cavalieri, Buonaventura
,
Geometria indivisibilibvs continvorvm : noua quadam ratione promota
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LIBERI.
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in Prop. </
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<
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<
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xml:space
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">Et vice verſaſi figuræ ſint ſimiles, & </
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<
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les, etiam homologas æquales eſſe, ſi enim inæquales eſſent, etiam ipſæ
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figuræ inæquales eſſent, quod eſt abſurdum. </
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<
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ſint inuicem ſuperpoſitæ, ita vt ſimiliter ſint conſtitutæ, ac duæ quæuis
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homologæ inuicem fuerint congruentes, etiam ipſas figuras fore con-
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gruentes, alioquin ſequerentur abſurda ſuperius demonſtrata, cum quę-
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uis aliæ homologæ neceſſariò quoque ſint æquales, quæ enim congruerunt
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ſunt æquales, & </
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<
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<
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xml:space
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ter ſe ſunt æquales.</
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<
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<
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">SI duobus parallelis quibuſcumque planis inciderint duo
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plana ſe ſe interſecantia, primum nempè, & </
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<
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</
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<
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">fuerint autem alia duo parallela quæcumque plana, quibus
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pariter incidant duo alia plana ſe ſe diuidentia, primum ſi-
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militer, & </
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<
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communes ſectiones angulos ęquales comprehenderint, nec-
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non primorum, ac ſecundorum planorum mutuæ ſectiones
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ad communes ſectiones primorum planorum cum planis pa-
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rallelis effe ct as angulos æquales conſtituerint, ipſa verò pri-
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ma plana ad plana parallela æquè fuerint ad eandem partem
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inclinata: </
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nes ſecundorum planorum cum planis parallelis effe ctas an-
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gulos pariter conſtituent æquales, necnon ſecunda plana e-
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runt ad eadem plana parallela æqualiter ad eandem partem
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inclinata.</
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<
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">Sint duo parallela quæcunque plana, BD, HV, quibus incidat
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duo plana, HA, primum, AV, ſecundum ſe ſe ſecantia in recta,
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AG. </
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bus pariter incidant alia duo plana, LY, primum, &</
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<
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">, Κ Λ, ſecun-
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dum, ſe ſe pariter ſecantia in recta, KY, communes vero ſectiones,
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BA, AD; </
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">LK, KQ, incidentium planorum cum planis paralle-
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lis contineant angulos æquales, ſit nempè, BAD, angulus æqua-
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lis angulo, LKQ, (erit. </
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cimi El.</
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ter ipſæ, AG, KY, cum ipſis, GH, Y &</
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quales, & </
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AGV, Κ Υ Λ, ęquales eſſe, necnonſecunda plana, AV, Κ Λ, </
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