Valerio, Luca, De centro gravitatis solidorum, 1604

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Si parallelepipedum AB, cuius axis CD, ſectum in
duo parallelepipeda AE, EN, quare & axis CD, in
axes CL, LD, parallelepipedorum AE, EN.
Et ſint
centra grauitatis; F, parallelepipedi EN, & G, paral­
lelepipedi AE, & H, parallelepipedi AB, in medio cu­
iuſque axis ex antecedenti.
Dico eſse FH, ad HG,
vt parallelepipedum AE, ad EN, parallelepipedum.
Iungantur enim diametri baſium oppoſitarum, quæ per
puncta axium D, L, G, tranſibunt, ADM, KLE,
NCB; iamque parallelogramma
erunt AB, AE, EN, DB, DE,
EC, propter eas, quæ parallelas
iungunt, & æquales: quorum bi­
na latera oppoſita ſecta erunt bi­
fariam in punctis C, L, D, per
definitionem axis: punctum igitur
F, in medio rectæ CL, oppoſi­
torum laterum bipartitorum ſectio­
nes coniungentis, erit parallelo­
grammi EN, centrum grauitatis.
Eadem ratione & parallelogram­
38[Figure 38]
mi AE, centrum grauitatis erit G, & H, parallelogram
mi AB.
Vt igitur parallelogrammum AE, ad paralle­
logrammum EN, hoc eſt, vt baſis ME, ad baſim EB;
hoc eſt, vt parallelogrammum MO, ad parallelogram­
mum OB: hoc eſt, vt parallelepipedum AE, ad paral­
lelepipedum EN: ita erit FH, ad HG.
Quod de­
monſtrandum erat.

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