Full text: Archimedes: Archimedis De iis qvae vehvntvr in aqva libri dvo

DE CENTRO GRAVIT. SOLID. bere proportionem, quam ſpacium g h ad dictã
figuram, hoc modo demonſtrabimus.

Intelligatur circulus, uel ellipſis x æqualis figuræ rectili-
neæ in g h ſpacio deſcriptæ: & ab x conſtituatur conus, uel
coni portio, altitudinẽ habens eandẽ, quã cylindrus uel cy
lindri portio c e. Sit deinde rectilinea figura, in quay eade,
quæ in ſpacio g h deſcripta eſt: & ab hac pyramis æquealta
conſtituatur. Dico conũ uel coni portionẽ x pyramidiy æ-
qualẽ eſſe. niſi enim ſit æqualis, uel maior, uel minor erit.

73.1.

0141-01

Sit primum maior, et exuperet ſolido z. Itaque in circu
lo, uel ellipſi x deſcribatur figura rectilinea; & in ea pyra-
mis eandem, quam conus, uel coni portio altitudinem ha-
bens, ita ut portiones relictæ minores ſint ſolido z, quem-
admodum docetur in duodecimo libro elementorum pro
poſitione undecima. erit pyramis x adhuc pyramide y ma
ior. & quoniam piramides æque altæ inter ſe ſunt, ſicuti ba
ſes; pyramis x ad piramidem y eandem proportionem ha-
bet, quàm figura rectilinea x ad figuram y. Sed ſigura recti

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