Cavalieri, Buonaventura
,
Geometria indivisibilibvs continvorvm : noua quadam ratione promota
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GEOMETRIÆ
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ſemicirculi, vel ſemiellipſis, FQB, eſſe vt quadratum, DB, ad re-
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ctangulum ſub, DB, BR, quoniam rectanguſa ſub, FD, & </
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circulo, vel ſemiellipſi, FQB, ſunt maiora omnibus quadratis ſemi-
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circuli, vel ſemiellipſis, FQB, ideò etiam rectangulum ſub, DB, B
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E, ſemper maius eſt rectangulo ſub, DB, BR, & </
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<
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ſemper cadet inter punctum, B, & </
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cadat punctum, I, vnde patet, &</
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<
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xml:space
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B, vna cum rectangulis ſub eodem, & </
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<
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xml:space
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">ſub quadrilineo, FQBDZ,
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bis ſumptis, minora ſunt omnibus quadratis, FD, ideò, BV, com-
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pofita ex tribus, BR, RE, EV, minor eſt ipſa, BD, nam, DB, ad,
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BV, eſt, vt omnia quadrata, FD, ad compoſitum ex omnibus quadra-
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tis ſemicirculi, vel ſemiellipſis, FQB, & </
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<
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ſub quadrilineo, FQBDZ, bis ſumptis, vnde omnia clarè patent.</
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omnibus quadratis quadrilinei, FQBDZ, eſſe, vt, DB, ad, BV.</
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<
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habebit latera eorundem diametris parallela; </
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autem quolibet laterum pro regula; </
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<
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parallelogrammi rectanguli, ad omnia quadrata circuli,
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vel ellipſis inſcripti, vna cum rectangulis bis ſub codem cir-
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culo, & </
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non fuerunt ſumpta pro regula, erunt, vt dictum parallelo-
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grammum ad dictum circulum, vel ellipſim.</
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">Sit circulus, vel ellipſis, MBEG, cuius centrum, A, per quod
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tranſeant diametri, ME, BG, ductis autem tangentibus circulum,
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vel ellipſim in punctis, M, B, E, G, donec concurrant, ſit eidem cir-
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cumſcriptum parallelogrammum, HF, quod habebit latera paral-
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lela ipſis axibus, ME, BG, ſit autem regula vtcunque, DF. </
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co ergo omnia quadrata parallelogrammi, HF, ad omnia quadra-
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ta circuli, vel ellipſis, MBEG, vna cum rectangulis bis ſub eodem
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circulo, vel ellipſi, MBEG, & </
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centibus lateri, NF, ſumpto vtcunque ex duobus, HD, NF, </
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