Cavalieri, Buonaventura
,
Geometria indivisibilibvs continvorvm : noua quadam ratione promota
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LIBER VII.
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adæquari. </
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xml:space
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CG, in, DH, cadet, G, in, H, quia, CG, DH, ſunt æquales, ca-
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dente verò trilineo, ECG, ſuper, FDH, extendetur, CE, ſuper, D
<
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F, cum angulus, FDH, exterior fit æqualis interiori, ECG; </
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<
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xml:space
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lelarum, DH, CG, & </
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<
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">punctum, E, erit in, F, ambituſque, ENG,
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cadet ſuper ambitum, FOH, ſi enim non, eſto quod aliquod pun-
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ctum ambitus, ENG, non cadat ſuper, FOH, cadet ergo, vel extra
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trilineum, FDH, vel intra, cadat extra, vt in, R, ita vt ambitus, E
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NGH, cadat vt, FRH, erit ergo, MR, maior, MO, ſed, MR, eſt
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æqualis, LN, ergo, LN, erit maior, MO, ſed eſt etiam æqualis ei-
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dem, MO, ex demonſtratis, ergo eſſet æqualis, & </
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<
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">maior eadem,
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MO, quod eſt abſurdum, non ergo aliquod punctum ambitus, EN
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G, cadit extra trilineum, FDH, eodem modo probabitur, nec ca-
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dere intra eundem trilineum, ergo ambitus, ENG, cadet ſuper am-
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bitum, FOH, congruens totus toti, & </
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<
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xml:space
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">conſequenter etiam trili-
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neus, ECG, congruet trilineo, FDH, & </
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<
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">illi æqualis erit, vnde abla-
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to communi trilineo, DIE, & </
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<
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xml:space
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">addito communi trilineo, GIH, fiet,
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EGHF, figura æqualis parallelogrammo, CH. </
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<
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">Eodem modo
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oſtendemus figuram, AGHB, æquari eidem, CH, ergo figuræ, A
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GHB, EGHF, inter ſe æquales erunt. </
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<
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">Cum autem dictæ figuræ
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fuerint in æqualibus baſibus, tum conſtituentes ſuper vnamquãq;
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</
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<
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xml:space
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">parallelogrammum in eiſdem parallelis cum ijidem poſitum, con-
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cludemus etiam dictas figuras æquales eſſe, probantes eodem mo-
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do deſcriptis parallelogrammis adæquari, quę quidem inter ſe erũt
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æqualia, quod demonſtrare opus erat. </
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<
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xml:space
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">Hæcautem vocentur pa-
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rallelogramma curuilinea, cum, AG, BH, EG, FH, fuerint curuæ
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lineæ, cum verò fuerint rectæ lineæ, parallelogramma rectilinea
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ad illorum differentiam eadem appeliabimus, ſed vtraq; </
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<
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re, ſi libuerit, nomine parallelogrammi tantum ctiam nuncupa-
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bimus.</
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eiſdem parallelis, fuerint quæcunq; </
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<
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">planæ figuræ, æ-
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qualiter analogæ iuxta dictas baſes; </
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<
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quidiſtantium quotcunq; </
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<
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">ipſis baſibus linearum in figuris
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conceptæ integræ fuerint, ac in altera dictarum figurarum
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ſic ſe habentes, vt quælibet propinquior baſi ſit maior re-
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motiori, dictæ figuræ interſe æquales erunt.</
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