Cavalieri, Buonaventura
,
Geometria indivisibilibvs continvorvm : noua quadam ratione promota
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GEOMETRIÆ
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">_H_Inc apparet, ſi producatur, GO, btcunq; </
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<
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<
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">circa ſemiaxes,
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bel ſemidiametros, HO, OE, deſcribi intelligatur ſemicirculus,
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vel ſemiellipſis, HEA, quod, ſi etiam producantur, ST, VX, in, N,
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M, & </
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<
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">iungantur, HN, HM; </
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<
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">omnia quadrata trianguli, HXM, ad
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omnia quadrata trianguli, HTN, regula, OE, erunt in ratione com-
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poſita ex ea, quam habet quadratum, XM, ad quadratum, TN, . </
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<
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">i re-
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ctangulum, AXH, ad rectangulum, ATH, & </
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<
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">ex ea, quam habet,
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XH, ad, HT, . </
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<
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">i. </
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<
s
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">erunt, bt parallelepipedum ſub altitudine, AX, baſt
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quadrato, XH, ad parallelepipedum ſub altitudine, AT, baſi qua-
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drato, TH.</
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">SI ad axim, vel diametrum datæ parabolæ ordinatim ap-
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plicentur duę rectæ lineę eandem ſecantes, deinde ſum-
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pto extremo puncto minoris dictarum ordinatim applicata-
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rum, & </
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<
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">alio extremo puncto maioris dictarum, ſed non ad
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eandem partem, iungantur dicta puncta recta linea; </
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<
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uidet quadrilineum duabus ordinatim applicatis incluſum
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in duo trilinea: </
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<
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">Trilineum igitur conſtitutum in maiori di-
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ctarum linearum ad trilineum cõſtitutum in minori tanquam
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in baſi erit, vt dicta maior ordinatim ductarum, ſimul cum
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tertia proportionali duarum, quarum prima eſt tripla com-
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poſitę ex minori, & </
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<
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">dimidia exceſſus maioris ſuper minorem,
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ſecunda autem eſt dimidia dicti exceſſus, ad eandem mino-
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rem, cum eadem tertia proportionali.</
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">Sit ergo parabola, cuius baſis, BH, axis, vel diameter, NO, due
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adipſam vtcunque ordinatim applicatæ ſint, BH, baſis, &</
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<
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">, AM,
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minor ipſa, BH, abſcindens parabolam, ANM, ſumatur autem
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vtcunque punctum, A, extremum minoris, AM, & </
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<
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ad aliam partem de duobus extremis maioris, BH, & </
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<
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">iungantur, A,
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H, puncta recta linea, AH, deindeà punctis, A, M, demittantur
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verſus, BH, parallelæipſi, NO; </
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<
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">AC, MG, erit ergo, BC, GH,
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exceſſus, BH, ſuper, AM, &</
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dicti exceſſus; </
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