Viviani, Vincenzo
,
De maximis et minimis, geometrica divinatio : in qvintvm Conicorvm Apollonii Pergaei
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ctionem M N, vt modò oſtendimus, ergo, & </
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<
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">ad rectam M B, quæ eſt in
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eodem trianguli plano perpendicularis erit, ſiue B M perpendicularis ſuper
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I M: </
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<
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">eodem modo oſtendetur B N perpendicularem eſſe ad L N.</
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<
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perpendicularis B A maior eſt B C, cum B A ſit _MAXIMVM_ Coni
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latus, & </
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<
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">ob eandem rationem eſt
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B A maior B I, ſed B I maior eſt B M, cum B M ſit perpendicularis ad I
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M, ac ideo _MINIMA_ ad ipſam I M, ergo B A eò magis maior erit per-
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pendiculari B M: </
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<
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">eodem modo demonſtrabitur B A maiorem eſſe perpen-
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diculari B N, & </
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<
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<
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Conilatus B A eſt _MAXIMA_ prædictarum perpendicularium.</
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<
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ſit _MINIMVM_ Coni latus. </
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">Ampliùs eſt perpendicularis E C
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perpendiculari E M, vnde, & </
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to E M, & </
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<
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">communi addito quadrato E B, erunt duo ſimul quadrata C E,
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E B, ſiue vnicum quadratum B C, minus duobus ſimul quadratis M E, E B,
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ſiue vnico quadrato B M (ponitur enim B E recta ad baſim, ac ideo cum om-
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nibus E C, E M, &</
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<
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<
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">rectos efficit angulos) hoc eſt recta B C, quæ perpen-
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dicularis eſt ad contingentem C H, minor erit recta B M, quæ eſt perpen-
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dicularis ad contingentem I M; </
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<
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">eadem ratione oſtendetur B C minorem
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eſſe perpendiculari B N, vel quacunque alia ex B ad quamlibet contingen-
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tium ducta: </
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<
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<
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">In ſecunda verò cum altitudo B E congruat cum perpendiculari B C ad
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contingentem C H, cumque eadem B E ſit _MINIMA_ ad planum baſis
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C, erit etiam perpendicularis B C _MINIMA_ ad idem planum, hoc eſt _MI-_
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_NIMA_ quarumlibet perpendicularium. </
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<
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recta B C, quæ eſt _MINIMVM_ Coni latus, perpendicularium ad prædi-
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ctas contingentes eſt _MINIMA_.</
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<
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cum contingente E G rectos efficiet angulos, ſed ipſa B E eſt
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Elem.</
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_MA_ ad ipſum baſis planum, quare, & </
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quarumlibet perpendicularium. </
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