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

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9167
THEOR. XIX. PROP. XXXVIII.
Nam in Parabolis pri-
61[Figure 61] mùm, cum ſit rectum BI
ad
rectum EL, vt ſegmẽ-
tum
BG ad EH, erit per-
mutando
IB ad BG, vt
LE
ad EH, vnde rectan-
gulum
I B G ſimile erit
rectangulo
LEH, quare
rectangulum
IBG ad LE
H
, erit vt quadratum la-
teris
I B ad quadratum
homologilateris
LE, ſed
rectãgulum
IBG 111. huius. tur quadrato GA, &
re-
ctãgulum
LEH quadra-
to
HD, vnde quadratum
GA
ad HD, erit vt qua-
dratum
IB ad LE, vel
applicata
GA ad HD, vt
rectum
IB ad rectum LE.
In Hyperbolis autem, &
Ellipſibus
cum ſit vt BI
ad
EL, vel ob ſectionum ſimilitudinem, vt MB ad NE, ita BG ad EH, erit
permutando
MB ad BG, vt NE ad EH, &
in Hyperbolis, componendo, in
Ellipſibus
autem diuidendo, MG ád GB, vt NH ad HE, quare rectangulum
MGB
ſimile erit rectangulo NHE, ſed rectangulum MGB ad quadratum
GA
eſt, vt MB ad BI, vel vt NE ad EL, vel vtrectangulum NHE ad 2221. pri-
mi
conic.
dratum HD, quare permutando rectangulum MGB ad rectangulum NHE,
vel
(ob ipſorum rectangulorum ſimilitudinem) quadratum BG ad quadra-
tum
EH, vel quadratum BI ad quadratum EL, erit vt quadratum GA ad
quadratum
HD, hoc eſt rectum BI ad rectum EL, vt applicata GA ad appli-
catam
HD.
Quod erat, & c.

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