Viviani, Vincenzo, De maximis et minimis, geometrica divinatio : in qvintvm Conicorvm Apollonii Pergaei

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In Ellipſi tandem tertiæ ſiguræ iuncta DA, cum in trianguiis DFB, DFA
ſit
BF ęqualis AF, &
communis FD baſis verò BD maior DA, erit 2286. h. BFD maior angulo DFA, & eiad verticẽ EFA maior angulo ad verticẽ BFE.
Si verò, in Ellipſi ABC, quar-
ſiguræ, axis BC fuerit minor.
Poſitis, & conſtructis ijſdem. Cum in triangulis AFD, BFD ſit latus AF æ-
qualle
lateri BF, &
commune FD, baſis verò AD maior baſi DB (cum minor
ſemi-axis
DB ſit _MINIMA_ ſemi-diametrorum) erit angulus AFD, ſiue 33ibidem. maior angulo BFD, hoc eſt AFE, ſuntque in triangulis BFE, AFE latera BF,
AF
inter ſe æqualia, &
latus FE commune: quare baſis BE, erit maior 4430. ſec.
conic
.
AE Quod ſuit vltimò demonſtrandum.

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