Viviani, Vincenzo
,
De maximis et minimis, geometrica divinatio : in qvintvm Conicorvm Apollonii Pergaei
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rint æqualiter inclinatæ, ſi ſint per vertices ſimul adſcriptæ, inter ſe mutuò
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congruant.</
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<
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vocetur ſuperficies à quadam ſectionis ordinatim ducta, & </
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aut circuli peripheria terminata. </
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BASIS PORTIONIS, SIVE SEGMENTI.</
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<
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dicatur differentia duorum ſegmétorum eiuſdem coni-
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ſectionis, quorum baſes ſint parallelæ.</
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<
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">Vt ſi ex coni-ſectione, vel circulo ABC abſcindan-
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tur duæ portiones ABC, DBE, quarum baſes AC, DE
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ſint parallelæ, ipſarum portionum differentia ADEC di-
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catur menſalis, & </
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ra eiuſdem menſalis.</
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per vertices ſimul adſcriptæ, ipſæ vel erunt in totum congruentes,
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& </
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">eiuſdem nominis, vel in totum diſiunctæ, præter in vertice, hoc
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eſt altera alteri inſcripta, vel in duobus tantùm punctis ſe mutuò ſe-
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cabunt in ipſis tamen verticibus ſe contingentes.</
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<
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">SInt in præſenti ſchematiſmo duæ quæcunque coni-ſectiones ABC, DBE
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mus 1. & 2.</
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æqualiter inclinatæ pereundem verticem B ſimul adſcriptę, quarum có-
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munis diameter ſit BF: </
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<
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in totum diſiunctæ, vel in duobus tantùm punctis, ſe mutuò ſecantes.</
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<
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quidiſtans BGH, quæ vtranq; </
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conic.</
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rectum latus ſectionis ABC, & </
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læ, ſectionis videlicet ABC, ſit HPL, & </
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<
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">Iam, vel regulæ GOI, HPL ſibi mutuò congruunt, vel infra contingen-
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tem BGH nunquam conueniunt, vel infra eandem ſe mutuò ſecant. </
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mùm, vt in primis 4. </
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dem nominis eſſe.</
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<
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">Sumpto enim in ſectione ABC quolibet puncto M, per ipſum ducatur ſe-
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ctionum communis ordinatim applicata MNFOP, ſectionem ſecans DBE in
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N, diametrum in F, regulam GI in O, NL in P. </
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guris, in quibus regulæ ſunt congruentes latitudines FO, FP ſunt æquales,
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& </
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<
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prop. 1. h.</
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DBE, æquale rectangulo BFP ſiue quadrato MF in ſectione ABC,
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brop. 1. h.</
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& </
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ueniunt ſimul in punctis N, & </
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