Cavalieri, Buonaventura
,
Geometria indivisibilibvs continvorvm : noua quadam ratione promota
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GEOMETRI Æ
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idem probabimus circa alias quaſcumque applicatas. </
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<
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verò oſtendemus rectangula, ℟XB, QDC, eſſe vt quadrata, BP, C
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N, ſicut rectangula, ℟XB, QZC, vt quadrata, BP, CM. </
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<
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intelligamus ſolidum rectangulum fieri ſub parallelogrammis, GX,
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XE, & </
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<
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">quadratum ſolidum, EP,
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communi regula, BP, erunt hæc
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ſolida inter ſe æqualiter, vel pro-
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portionaliter, analoga, cum ſint
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in eiſdem planis parallelis, nem-
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pè tranſeuntibus per lineas, ℟P,
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GH, & </
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<
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<
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">plana his pa-
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rallela præfata ſolida ſecantia,
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producant in ipſis æquales figu-
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ras planas, vel ſaltem proportionales, ſicut patuit de rectangulo, Q
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ZC, æquali quadrato, CM; </
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<
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">vel ad idem exiſtente, vt rectangulum,
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℟XB, ad quadratum, BP. </
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<
s
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">Eadem ratione, quia probauimus re-
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ctangulum, QDC, æquari quadrato, CN, vel ad idem eſſe vt re-
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ctangulum, ℟XB, ad quadratum, BP, concludemus ſolidum rectã-
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gulũ ſub trapezio, EG℟X, & </
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<
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xml:space
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">triangulo, EXB, eſſe ęqualiter, vel pro-
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portionaliter, analogum quadr. </
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<
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xml:space
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">ſolido, EBP, iuxta communem re-
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gulam, BP, igitur rectangulum ſolidum, ſub GX, XF, æquabitur qua-
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drato ſolido, EP, & </
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<
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xml:space
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">rectangulum ſolidum ſub, EG℟X, EXB, ęqua-
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bitur quadrato ſolido, EBP, vel ſaltem erunt proportionalia in el-
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lipſi, ergo quadratum ſolidum, EP, ad quadr. </
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<
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xml:space
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">ſolidum, EBP, erit
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">1. huius.</
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vt rectangulum ſolidum ſub, GX, XE, ad rectangulum ſolidum
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ſub, EG℟X, &</
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<
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& </
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<
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">XB, ideſt, vt, RB, ad compoſitam ex {1/2}. </
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<
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<
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">BE, ergo,
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iterum conſpecta figura prop. </
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<
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nis, DEP, ad quadratum ſolidum, EP, erit vt compoſita ex {1/6}. </
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& </
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">BR, ad ipſam, BR, cum enim ſemiportiones, DEB, BEP,
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ſint homologę ſecundum regulam planum tranſiens per regulam,
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BP, cuiæquidiſtant plana ſolida ſecantia, ſicut etiam, FB, BH, & </
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cum quadratum ſolidum figuræ, FP, diuiſæ per lineam, EB, æque-
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huius.</
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tur quadratis ſolidis, FB, BH, & </
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BH, ideſt quatuor quadratis ſolidis, BH, ideò quadratum ſolidum,
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FP, quadruplum erit quadrati ſolidi, BH, ſicut etiam patebit qua-
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dratum ſolidum portionis, DEP, quadruplum eſſe quadrati ſolidi
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ſemiportionis, EBP, ergo, vt quadratum ſolidum, EBP, ad qua-
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dratum ſolidum, BH, ita eſt quadratum ſolidum portionis, DEP, ad
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quadratum ſolidum, DH, ideſt vt compoſita ex {1/6}. </
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<
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<
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ipſam, BR, quod oſtendendum erat.</
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