Valerio, Luca, De centro gravitatis solidorvm libri tres

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1ratione, tam duorum triangulorum ABG, DGE, quàm
duorum AFG, CDG, ſimul, centrum grauitatis erit G;
totius igitur polygoni ABCDEF; centrum grauitatis
erit idem G.
Manifeſtum eſt igitur propoſitum.
PROPOSITIO XXII.
Omnis figuræ circa diametrum in alteram par
tem deficientis, in diametro eſt centrum graui­
tatis.
Sit figura ABC, circa diametrum BD, in alteram par
tem deficiens verſus B.
Dico centrum grauitatis figuræ
ABC, eſse in linea BD. ſit enim punctum E, generali­
ter extra lineam BD.
Et per puncta E, C, ducantur ipſi
BD, parallelæ EF,
CG, & vt eſt CD,
ad DF, ita ponatur
figura ABC, ad ali­
quod ſpacium M: &
figuræ ABC, inſcri­
batur figura ex paral­
lelogrammis æqua­
lium altitudinum de­
ficiens à figura ABC,
minori defectu, quam
ſit ſpacium M, quan­
tumcumque illud ſit:
minor igitur propor­
32[Figure 32]
tio erit figuræ ABC, ad ſpacium M, hoc eſt minor pro­
portio CD, ad DF, quàm figuræ ABC, ad ſui reliquum,
dempta figura inſcripta.
Quoniam autem diameter BD,

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