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

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20826 in F, G (nam Parabole A B C eſt _MINIMA_ Ellipſi F B G 11ibidem. ptibilium) è quorum altero F ducta ſit ordinata F H I communem axem
222. primi
huius.
in H, regulam verò ſecante in I;
ſitque F L Parabolen contingens ad F, axemque ſecans in L.
3324. pri-
mi conic.
169[Figure 169]
Iam, in triangulo E B D cum ſit E B dupla B D, erit I H dupla H D,
ſed eſt quoque L H dupla H B, quare vt L H ad H B, ita I H ad H D:
rectangulum ergo L H D æquale eſt rectangulo B H I, ſiue quadrato 44Coroll.
primæ 1.
huius.
H, eſtque F H ipſi L D perpendicularis, quare angulus D F L rectus &
F L Parabolen contingit in F: vnde D F eſt _MINIMA_ ducibilium 55203. Se-
pt. Pappi.
dato puncto D ad peripheriam Parabolæ F B G.
Conſimili ratione oſten-
detur, quamlibet aliam inſcriptam P B R Ellipſis peripheriam B F G D
6611. huius
ad nu. 1.
ſecare, vt in P, R, &
iunctam D P, vel D R eſſe _MINIMAM_, & c. Qua-
re ſemita _MINIMARV M_ ex D ad huiuſmodi Parabolarum peripherias, eſt
prædictæ Ellipſis perimeter.
Quod oſtendere propoſitum fuit.
PROBL. II. PROP. XXII.
A dato puncto, ad datę Hyperbolæ peripheriam, MINI-
MAM rectam lineam ducere.
170[Figure 170]
SIt data Hyperbole A B C,
cuius axis B D, rectum B E
tranſuerfum verò B G, centrum
H, &
datum vbicunque ſit pun-
ctum F.
Oportet ex F ad Hyper-
bolæ peripheriam A B C _MINI-_
_MAM_ rectam lineam ducere.
Si primò datum punctum F,
in prima figura fuerit in axe pro-
ducto, extra Hyperbolen, ipſa
F B erit _MINIMA_.
7710. h.

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