Ceva, Giovanni, Geometria motus, 1692

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VErùm vt propoſitum oſtendamus, eſto quælibet ex
parabolis
GFK, nimirum quadratocubus ex FG ad
quadratocubum
ex IH habeat eandem rationem, quam̨
cubus
ex FK ad cubum ex IK. Demonſtro, rectangulum
GF
in FK habere eandem rationem ad parabolam GFK,
quam
aggregatum exponentium 8 ad maiorem exponen­
tem
5. Primùm, quam rationem habet rectangulum GF in
FK
ad parabolam GFK, eandem habebit rectangulum HI
in
IK ad parabolam HIK (hoc enim demonſtrabimus in­
frà
) permutandoque, erit rectangulum GF in FK ad re­
ctangulum
HI in IK, vt parabola GFK ad parabolam HIK;
componuntur
verò illa rectangula ex rationibus GF ad
IH
, & FK ad IK, ergo etiam parabola ad parabolam com-

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