Valerio, Luca, De centro gravitatis solidorum, 1604

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Sit quælibet figura plana A. Dico figuræ A, rectan­
gulum æquale poſse exiſtere.
Exponatur enim rectan­
gulum BC, cuius latus BD, in infinitum producatur
verſus E.
Quoniam igitur eſt vt rectangulum BD, ad
planam figuram A, ita recta BD, ad aliquam lineam
rectam ſit vt BC, ad A, ita BD, ad DE, & comple­
atur rectan­
gulum EC.
Quoniam igi
tur eſt vt BD
ad DE, ita
rectangulum
BC, ad figu­
ram A: ſed
vt BD, ad
DE, ita eſt
11[Figure 11]
rectangulum BC, ad rectangulum CE; vt igitur re­
ctangulum BC, ad figuram A, ita eſt rectangulum
BC, ad rectangulum CE; rectangulum ergo CE, fi­
guræ A, æquale erit.
Manifeſtum eſt igitur propoſitum.
PROPOSITIO VI.
Omni figuræ circa diametrum in alte ram par­
tem deficienti figura quædam ex parallelogram­
mis æqualium altitudinum inſcribi poteſt, & al­
tera circumſcribi, ita vt circumſcripta ſuperet in­
ſcriptam minori ſpacio quantacumque magnitu­
dine propoſita.
Semper autem in ſimilibus intelli­
ge, eiuſdem generis.
Sit figura plana ABC circa diametrum AD, ad par-

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