Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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1fruſtum pyramidis ſit abſciſſum. erit ex iis quæ proxime
tradidimus, fruſti pyramidis ad centrum grauitatis l.
Quo
niam igitur portiones ſpacio o minores ſunt; habebit cir
71[Figure 71]
culus, uel ellipſis ab ad
portiones dictas maiorem
proportionem, quàm nl
ad lm.
ſed ut circulus, uel
ellipſis ab ad portiones,
ita apb conus, uel coni
portio ad ſolidas portio­
nes, id quod ſupra demon
ſtratum eſt: & ut circulus

uel ellipſis cd ad portio­
nes, quæ ip ſi inſunt, ita co
nus, uel coni portio cpd
ad ſolidas ipſius portio­
nes.
Quòd cum figuræ in
circulis, uel ellipſibus ab
cd deſcriptæ ſimiles ſint,
erit proportio circuli, uel
ellipſis ab ad ſuas portio
nes, eadem, quæ circuli uel
ellipſis cd ad ſuas.
ergo
conus, uel coni portio ap
b ad portiones ſolidas ean­
dem
habet proportionem,
quam conus, uel coni por
tio cpd ad ſolidas ipſius

portiones.
reliquum igi­
tur coni, uel coni portionis fruſtum, ſcilicet ad ad reliquas
portiones ſolidas in ipſo contentas eandem proportionem
habet, quam conus, uel coni portio apb ad ſolidas portio
nes: hoc eſt eandem, quam circulus, uel ellipſis ab ad por
tiones planas.
quare fruſtum coni, uel coni portionis ad

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