Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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1bere proportionem, quam ſpacium gh ad dictam
figuram, hoc modo demonſtrabimus.
Intelligatur circulus, uel ellipſis x æqualis figuræ rectili­
neæ in gh ſpacio deſcriptæ.
& ab x conſtituatur conus, uel
27[Figure 27]
coni portio, altitudinem habens eandem, quam cylindrus uel cy
lindri portio ce.
Sit deinde rectilinea figura, in qua y eadem,
quæ in ſpacio gh deſcripta eſt: & ab hac pyramis æquealta
conſtituatur.
Dico conum uel coni portione x pyramidi y æ­
qualem
eſſe.
niſi enim ſit æqualis, uel maior, uel minor erit.
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 a, 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 figura recti

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