Cavalieri, Buonaventura
,
Geometria indivisibilibvs continvorvm : noua quadam ratione promota
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LIBER II.
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dem plano, & </
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">in eadem altitudine, quæ ſint, BCDA, ADE, ſit
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autem altitudo figuræ, ABCD, ſumpta reſpectu ipſius rectæ, CD,
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& </
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<
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">altitudo figuræ, ADE, reſpectu ipſius, DE, quæ intelligantur
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abſcindere ex eadem parte à communi altitudine partes æquales,
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quæ ſibi in directum erunt, ſint verò ambæ communis regula om-
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nium linearum dictarum figurarum, & </
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<
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dem, CE, parallela, MN,
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cuius portio manens in figu-
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ra, BD, ſit, MO, & </
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<
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nens in figura, ADC, ſit,
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ON; </
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<
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xml:space
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">rectangula igitur, C
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DE, MON, & </
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">_Definit. i._
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_huius._</
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ctangula, quæ ſub qualibet
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earum, quæ dicuntur omnes lineæ figuræ, BD, (regula, CE, vel,
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CD,) & </
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<
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">illi in directum poſita in figura, ADE, continentur (erit
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autem ſemper aliqua eidem in directum, præterquam fortè illi, qua
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tangit figuram, vt, BA, potest .</
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<
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<
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">in figura, ADE, illi vice lineæ
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vnum punctum tantum reſpondere, vt, A, hoc tamen rect augulum
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non computatur, quia nihil illis adiungit, erit inquam bæc linea-
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rum reſpondentia in figura, ADE, eis, quæ ſumuntur in, BD, nam
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ſunt in eadem altitudine ſumpta aſpectu earundem linearum, ſub
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quibus rectangula continentur) ſimul ſumpta vocamus: </
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">_D. Def. 8._
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_huius._</
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la ſub figuris, BCDA, ADE.</
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<
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grammum, & </
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<
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">regulam omnium eiuſdem linearum eſſe vnum eiu-
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ſdem laterum, vt, CD, reſpectu cuius ſumitur altitudo, tune quia
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illæ, quæ æquidiſtantipſi, CD, in parallelogrammo, BD, ſunt ei-
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dem, CD, æquales, & </
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<
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">ſunt latera dictorum rectangulorum, ideò
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dico, nos ea vocare poſſe nedum rectangula ſub his figuris, ſed etiam
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ſic appellare, nempè. </
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<
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">Omnia rectangula figuræ ADE, (quæ non,
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eſt neceſſariò parallelogrammum) æquè alta, ac vnum eorum .</
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<
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rectangulum, CDE, altitudinis ſcilicet æqualis ipſi, CD, prout
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libuerit autem nominentur.</
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