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

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Iam cum ſit AH æqualis H C, erit LF. _l f_ æqualis F O. _f o_, eſtque IF. _if_
æqualis
FN.
_fn_, & GF. _gf_, ipſi FM. _fm_ (ſunt enim ſectionum ſemi-appli-
catæ
) quare reliquæ LI.
_li_, ON. _on_, æquales erunt, itemque LG. _lg_, OM.
_o m_ inter ſe æquales, ideoque rectangulum OIL. _oil_ æquabitur rectangulo
NLI
.
_nli_, & rectangulum OGL. _ogl_ rectangulo MLG. _mlg_. Et cum in ſe-
3316. tertij
conic
.
ctione ABC ſit quadratum BQ ad quadratum QA, hoc eſt quadratum SP ad PA, vt rectangulum NLI.
_nli_ ad quadratum L A. _l_A, & in ſectione
44ibidem. ADC quadratum DP ad idem PA ſit vt rectangulum MLG.
_mlg_ ad idem quadratum L A. _l_A, habeatque quadratum SP ad PA minorem rationem
quàm
DP quadratum, ad idem quadratum PA, habebit quoque rectangu-
lum
NLI.
_nli_ ad quadratum LA. _l_A minorem rationem quàm rectangulum
MLG
.
_mlg_ ad idem quadratum LA. _l_A; quare rectangulum NLI. _nli_, hoc
eſt
OIL.
_oil_, minus eſt rectangulo MLG. _mlg_, ſiue rectangulo OGL. _ogl_;
55conuerſ.
60
. h.
vnde punctum I remotius eſt ab ipſo F quàm pũctum G.
_g_, ſed I. _i_ eſt in ipſa ſectione ABC; quare punctum G. _g_ ſectionis ADC cadet intra ABC, & ſic
de
quolibet alio puncto ſectionis SADCT, præter A, C:
vnde ipſa ADC in-
ſcripta
erit ſectioni ABC, &
in punctis tantùm A, C extremis eiuſdem ap-
plicatæ
ſe mutuò contingent.
Quod erat deinonſtrandum.

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