Cavalieri, Buonaventura
,
Geometria indivisibilibvs continvorvm : noua quadam ratione promota
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cumferentiam, CD, eſt
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autem circulus, ABCD,
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æqualis triang. </
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<
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ergo triangulus, HOM,
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ad ſectorem, ECD, eſt
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vt circumferẽtia, ABCD,
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ad circumferentiam, CD,
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ideſt vt, OM, ad, MN, id-
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eſt vt triangulus, HOM,
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ad, HNM, igitur idem
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triangulus, HOM, ad ſe-
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ctorem, ECD, ad trian-
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gulum, HNM, eandem
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habet rationem, ergo ſector, ECD, eſt æqualis triangulo,
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HNM, quod oſtendere opus erat.</
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">_H_Inc patet, ſi ſumpto vtcumque puncto in, ED, vt, X, centro,
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E, ad diſtantiam, X, circuferentia, FZX, deſcripta fuerit in-
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ſuper abſciſſa, HR, æquali ipſi, EX, per, R, ducta fuerit, SR, parllela
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ipſi, OM, ſecans, HN, in, I, trape zium, OSRM, æquari reſiduo circu-
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li, ABCD, ab eo dempto circulo, FZX, quod reſiduum dicatur faſcia
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circulorum, BD, FX, nam circulus, BD, ad circulum, FX, eſt vt qua-
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dratum, DE ad quadratum, EX, ideſt vt quadratum, MH, ad qua-
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dratum, HR, ideſt vt triangulus, HOM, ad triangulum, HSR, vnde,
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_11. l. 3._</
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quia circulus, BD, æquatur triangulo, HOM, etiam circulus, FZX,
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æquatur triangulo, HSR, vnde faſcia, BF, æquatur trapezio, OSRM;
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</
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">eoden modo colligemns reſiduum ſectoris DEC, ab eo dempto ſectore,
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xlink:label
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xlink:href
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xml:space
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">_Coroll. 1._
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_19. l. 2._</
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XEZ, quod dicatur eorundem ſectorum faſcia, ſcilicet ipſum, ZXDC,
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æquart trapezio, IRMN.</
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<
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">_P_Atet inſuper, quia circulus, CDB, æquatur triangulo, HOM, & </
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circulus, FZX, triang. </
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OM, &</
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<
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">, FZX, ipſi, SR, (nam, DE, æquatur ipſi, MH, &</
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<
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">, EX, ipſi, RH,)
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quod veluti, OM, ad, SR, eſt vt, MH, ad, HR ita circumferentia, ABCD,
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ad, FZX, erit vt, DE, ad, EX. </
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<
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">Sic etiam oſtendemus ſimilium ſectorum,
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CED, ZEX, circumferentias, CD, ZX, eſſe vt ſemidiametri, DE EX, & </
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ipſos ſimiles ſectores eſſe vt quadrata ſemidiametrorũ, DE, EX, </
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