Valerio, Luca, De centro gravitatis solidorvm libri tres

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1
PROPOSITIO XLI.
Omnis cylindri centrum grauitatis axim bifa­
riam diuidit.
Sit cylindrus ABCD, cuius axis EF, & ſit ſectus bi­
fariam in puncto G.
Dico punctum G, eſse centrum
grauitatis cylindri ABCD.
Nam ſi cylindro AD, in­
ſcriptum intelligatur priſma,
cuius baſes oppoſitæ æquilate­
ræ ſint, & æquiangulæ; erunt,
qua ratione ſupra diximus, ea­
rum centra figuræ, & grauitatis
E, F; axis igitur inſcripti priſ­
matis erit EF: & centrum gra
uitatis G. poteſt autem tale
priſma ſic inſcribi cylindro
ABCD, vt ab illo deficiat
minori ſpacio quantacumque
magnitudine propoſita; cylin­
dri igitur ABCD, centrum
grauitatis erit G.
Quod demonſtrandum erat.
57[Figure 57]
PROPOSITIO XLII.
Sphæræ, & ſphæroidis idem eſt centrum gra­
uitatis, & figuræ.
Sit ſphæra, vel ſphæroides ABCD, cuius centrum E,

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