Archimedes, Archimedis De iis qvae vehvntvr in aqva libri dvo

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16728DE CENTRO GRAVIT. SOLID. uel coni portionis axis à centro grauitatis ita diui
ditur, ut pars, quæ terminatur ad uerticem reli-
quæ partis, quæ ad baſim, ſit tripla.
Sit pyramis, cuius baſis triangulum a b c; axis d e; & gra
uitatis centrum _K_.
Dico lineam d k ipſius _K_ e triplam eſſe.
trianguli enim b d c centrum grauitatis ſit punctum f; triã
guli a d c centrũ g;
& trianguli a d b ſit h: & iungantur a f,
b g, c h.
Quoniam igitur centrũ grauitatis pyramidis in axe
cõſiſtit:
ſuntq; d e, a f, b g, c h eiuſdẽ pyramidis axes: conue
1117. huíus nient omnes in idẽ punctũ _k_, quod eſt grauitatis centrum.
Itaque animo concipiamus hanc pyramidem diuiſam in
quatuor pyramides, quarum baſes ſint ipſa pyramidis
triangula;
& axis pun-
88[Handwritten note 8] ctum k quæ quidem py-
ramides inter ſe æquales
ſunt, ut demõſtrabitur.
Ducatur enĩ per lineas
d c, d e planum ſecãs, ut
ſit ipſius, &
baſis a b c cõ
munis ſectio recta linea
c e l:
eiuſdẽ uero & triã-
guli a d b ſitlinea d h l.

erit linea a l æqualis ipſi
l b:
nam centrum graui-
tatis trianguli conſiſtit
in linea, quæ ab angulo
ad dimidiam baſim per-
ducitur, ex tertia deci-
ma Archimedis.
quare
221. ſexti. triangulum a c l æquale
eſt triangulo b c l:
& propterea pyramis, cuius baſis trian-
gulum a c l, uertex d, eſt æqualis pyramidi, cuius baſis b c l
triangulum, &
idem uertex. pyramides enim, quæ ab eodẽ
335. duode-
cimi.