Archimedes, Archimedis De iis qvae vehvntvr in aqva libri dvo

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DE CENTRO GRAVIT. SOLID.
Figure: /permanent/library/4E7V2WGH/figures/0143-01 not scanned
[Figure 96]
ni portionem, ita eſt c_y_lindrus ad c_y_lindrum, uel c_y_lin-
dri portio ad c_y_lindri portionem:
& ut p_y_ramis ad p_y_ra-
midem, ita priſma ad priſma, cum eadem ſit baſis, &
æqua
lis altitudo;
erit c_y_lindrus uel c_y_lindri portio x priſma-
ti _y_ æqualis.
eftq; ut ſpacium g h ad ſpacium x, ita c_y_lin-
drus, uel c_y_lindri portio c e ad c_y_lindrum, uel c_y_lindri por-
tionem x.
Conſtatigitur c_y_lindrum uel c_y_lindri portionẽ
c e, ad priſina_y_, quippe cuius baſis eſt figura rectilinea in
7. quintiſpacio g h deſcripta, eandem proportionem habere, quam
ſpacium g h habet ad ſpacium x, hoc eſt ad dictam figuram.
quod demonſtrandum fuerat.

THE OREMA IX. PROPOSITIO IX.

Si pyramis ſecetur plano baſi æquidiſtante; ſe-
ctio erit figura ſimilis ei, quæ eſt baſis, centrum
grauitatis in axe habens.

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