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

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9975
LEMMA V. PROP. XXXXIII.
Si duo triangula ABC, DEF, habuerint circa angulos B, E,
latera
AB, BE, item@altera BC, EF inter ſe æqualia, &
in angulis
BAC
, EDF applicatæ ſint GH, IL parallelæ ad BC, EF, ſitque
rectangulum
BGH æquale rectangulo EIL.
Dico latera BG, EI
inter
ſe æqualia eſſe.
ESto, ſi fieri poteſt, alterum ipſorum laterum, quale eſt BG, maius alte-
ro
EI:
habebit ergo GB ad BA, maiorem rationem quam IE ad ED ipſi
BA
æqualem, &
componendo GA
68[Figure 68] ad AB maiorem rationem quàm ID
ad
DE, ſed GA ad AB, eſt vt GH ad
BC
, &
ID ad DE, vt IL ad EF; ergo
GH
ad BC habet maiorem rationem
quàm
IL ad EF, hoc eſt ad ſibi æqua-
lem
BC, quare GH erit maior IL, &

ponitur
BG maior EI, vnde rectan-
gulum
BGH maius eſt rectangulo
EIL
:
quod eſt contra hypoteſim.
Sunt ergo BG, EI interſe æquales. Quod erat, & c.

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