Valerio, Luca, De centro gravitatis solidorum, 1604

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1rum quartæ partes EN, FO, & iungatur NO. Quoniam
igitur propter æqualitatem altitudinum, & quia EF, GH,
ſunt in eodem plano, ſunt EF, GH, inter ſe parallelæ, &
vt GN ad NE, ita eſt HO ad OF; erit NO ipſi E Fivel
GH, paralle­
la, quas KL
bifariam ſecat:
igitur & ipſam
NO ſecabit bi
fariam, iungit
autem recta
NO centra
grauitatis py­
ramidum
æqua­
lium GAC,
HDB, vtriuſ­
95[Figure 95]
que ergo pyramidis ſimul centrum grauitatis erit in com­
muni ſectione duarum linearum KL, NO, ſed recta NO,
ſecans ſimiliter ipſas GE, KL, HF, ipſam KL, ſecabit
in puncto M; punctum igitur M, erit prædictarum pyrami­
dum centrum grauitatis.
Quod demonſtrandum erat.
PROPOSITIO XXIII.
Omnis fruſti pyramidis baſim habentis paral­
lelogrammum centrum grauitatis maiori baſi eſt
propinquius, quam punctum illud, in quo axis ſic
diuiditur, vt pars minorem baſim attingens ſit ad
reliquam vt dupla cuiuſuis laterum maioris baſis
vna cum latere minoris ſibi reſpondente, ad duplam
dicti lateris minoris baſis vna cum maioris ſibi
reſpondente.

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