Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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128[Figure 28]
linea x cum ſit minor circulo, uel ellipſi, eſt etiam minor fi­
gura rectilinea y.
ergo pyramis x pyramide y minor erit.
Sed & maior; quod fieri non poteſt. At ſi conus, uel coni por
tio x ponatur minor pyramide y: ſit alter conus æque al­
tus, uel altera coni portio X ipſi pyramidi y æqualis.
erit
eius baſis circulus, uel ellipſis maior circulo, uel ellipſi x,
quorum exceſſus ſit ſpacium ω. Si igitur in circulo, uel eili­
pſi X figura rectilinea deſcribatur, ita ut portiones relictæ
ſint ω ſpacio minores, ciuſmodi figura adhuc maior erit cir
culo, uel ellipſi x, hoc eſt figura rectilinea y.
& pyramis in
ca conſtituta minor cono, uel coni portione X, hoc eſt mi­
nor pyramide y.
eſt ergo ut X figura rectilinea ad figuram
rectilineam y, ita pyramis X ad pyramidem y.
quare cum
figura rectilinea X ſit maior figura y: erit & pyramis X py­
ramide y maior.
ſed erat minor; quod rurſus fieri non po­
teſt.
non eſt igitur conus, uel coni portio x neque maior,
neque minor pyramide y.
ergo ipſi neceſſario eſt æqualis.
Itaque quoniam ut conus ad conum, uel coni portio ad

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