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

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140120GEOMETRIÆ ei, quam habet, CO, ad, RZ, vel, CD, ad, RX, cum ſunt æqui-
angula, ergo æqualia parallelogramma baſes habent altitudinibus,
vel lateribus æqualiter baſibus inclinatis reciprocas, quod oſtendere
opus erat.
THEOREMA VIII. PROPOS. VIII.
SImilia parallelogramma ſunt in dupla ratione laterum
homologorum.
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-
pè, 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.
COROLLARIVM.
_H_Inc patet, quæ de parallelogrammis in ſuperioribus Propoſitioni-
bus oſtenſa ſunt, eadem de eorundem omnibus lineis cum quibuſ.
uis regulis aſſumptis pariter verificari, nam illa ſunt, vt ipſa paralle-
44_3. huius._logramma.
THEOREMA IX. PROPOS. IX.
PArallelogrammorum in eadem altitudine exiſtentium
omnia quadrata, regula baſi, iuxta quam altitudo ſum-
55A. Def. 8.
huius.
pta eſt, ſunt inter ſe, vt quadrata baſium.

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