Archimedes, Archimedis De iis qvae vehvntvr in aqva libri dvo

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186FED. COMMANDINI fruſtum pyramidis ſit abſciſſum. erit ex iis quæ proxime
tradidimus, fruſti pyramidis a d centrum grauitatis l.
Quo
niam igitur portiones ſpacio o minores ſunt;
habebit cir
culus, uel ellipſis a b ad
portiones dictas maiorẽ
proportionem, quàm n l
ſed ut circulus, uel
ellipſis a b ad portiones,
ita a p b conus, uel coni
portio ad ſolidas portio-
nes, id quod ſupra demon
ſtratum eſt:
& ut circulus
uel ellipſis c d ad portio-
1122. huius nes, quæ ipſi inſunt, ita co
nus, uel coni portio c p d
ad ſolidas ipſius portio-
nes.
Quòd cum figuræ in
circulis, uel ellipſibus a b
c d deſcriptæ ſimiles ſint,
erit proportio circuli, uel
ellipſis a b ad ſuas portio
nes, eadẽ, quæ circuli uel
ellipſis c d ad ſuas.
ergo
conus, uel coni portio a p
b ad portiones ſolidas eã-
dem habet proportionẽ,
quam conus, uel coni por
tio c p d ad ſolidas ipſius
portiones.
reliquum igi-
2219. quinti tur coni, uel coni portionis fruſtũ, ſcilicet a d ad reliquas
portiones ſolidas in ipſo contentas eandem proportionẽ
habet, quam conus, uel coni portio a p b ad ſolidas portio
nes:
hoc eſt eandem, quam circulus, uel ellipſis a b ad por
tiones planas.
quare fruſtum coni, uel coni portionis a