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

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20624 F G recta G H ęqualis dimidio re-
167[Figure 167] cti B E, &
ex H agatur H I paral-
114. ſec.
conic
.
lela ad G F, &
in angulo I H D per
punctum
F deſcribatur Hyperbo- le F A, quæ Parabolæ periphe-
2212. h. riam in vno tantùm puncto A ſe-
cabit
, &
iungatur F A. Dico hãc eſſe _MINIMAM_ quæſitam.
Applicetur A L, & ex A duca-
tur
contingens A M, axi occur-
338. ſecũ-
di
conic.
rens in M, producaturque F A ad
vtranque
partem, quæ cum aſym-
ptotis
conueniet in I, D, eruntq;
in vtraque figura, interceptę A I,
F
D inter ſe ęquales, ac ideo H L,
G
D ęquales erunt, ob ęquidiſtan-
tes
lineas I H, A L, F G, in trian-
gulo
I H D;
ſi ergo, in tertia figu-
ra
, dematur communis L G, &

in
quarta, addatur, fient H G,
L
D inter ſe æquales;
ſed eſt G
H
dimidia B E, quare, &
L D
ipſius
B E dimidia erit.
Et quo-
niam
quadratum A L æquatur re-
44Coroll.
primæ
1.
huius
.
ctangulo L B E, &
rectangulum L B E, æquale eſt rectangulo ſub
5535. pri-
mi
conic.
dupla L B, ſiue ſub M L, &
ſub dimidia B E, hoc eſt ſub L D, ergo qua- dratum A L æquale erit rectangulo M L D, ac ideo angulus M A D re-
66203. Se-
pt
. Pappi.
ctus erit, ſiue F A erit ex contactu A contingenti A M 7710. h. &
11
. h. ad
num
. 1.
laris:
quare F A, in vtraque figura, erit _MINIMA_ quæſita. Quod fa- ciendum erat.

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