Cavalieri, Buonaventura, Geometria indivisibilibvs continvorvm : noua quadam ratione promota

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THEOREMA VIII. PROPOS. VIII.
Sint ſimilia parallelogramma, AC, EG. Dico eadem eſſe in du-
11lux diff.
Sex
. El.
plarat one laterum homologorum:
Quoniam enim ſunt ſimilia illa
ſunt
æquiangula, ſint anguli, BCD, FGH, æquales, &
latera ho-
80[Figure 80] mologa, BC, FG;
CD, GH, ſi ergo pro
baſibus
ſumpierimus ipſas, BC, FG, erit,
226. huius. AC, ad, EG, in ratione compoſita ex ea,
quam
habet, BC, ad, FG, &
ex ea, quam
habet
, DC, ad, HG, quæ eſt eadem ei,
quam
habet, BC, ad, FG, vel, FG, ad
tertiam
proportionalem duaru, primę nem-
, BC, &
ſecundæ, FG, ergo, AC, ad, EG, erit vt, BC, ad ter-
tiam
proportionalem duarum primę, nempè, BC, &
@ecundę, FG,
.
i. erit in dupla ratione eius, quam habet, BC, ad, FG, vel, CD,
33Defin. 10.
5
. Elem.
ad, GH, quod oſtendere opus erat.

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