Archimedes, Archimedis De iis qvae vehvntvr in aqva libri dvo
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13110DE CENTRO GRA VIT. SOLID. 87[Figure 87]
THE OREMA VIII. PROPOSITIO VIII.
Cuiuslibet priſmatis, & cuiuslibet cylindri, uel
cylindri portionis grauitatis centrum in medio
ipſius axis conſiſtit.
Sit primum a f priſma æ quidiſtantibus planis contentũ,
quod ſolidum parallelepipedum appellatur:
& oppoſito-
rum planorum c f, a h, d a, f g latera bifariam diuidantur in
punctis k l m n o p q r s t u x:
& per diuiſiones ducantur
plana κ n, o r, s x.
communes autem eorum planorum ſe-
ctiones ſint lineæ y z, θ φ, χ ψ:
quæ in puncto ω conueniãt.
erit ex decima eiuſdem libri Archimedis parallelogrammi
c f centrum grauitatis punctum y;
parallelogrammi a

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