13212056[Figure 56]
T B, ſint illa, quæ otiuntur ex ſemipar abola D B C,
reuoluta circa C F, duo vero media ſint illa, quæ
oriuntur ex reuolutione ſemiparabolæ A B D, cir-
ca baſim B D, nempe ſint duo ſemifuſi parabolici
ex data ſemiparabola. Ex propoſit. anteced. con-
ſtat quatuor ſolida ſecundæ figuræ eſſe proportiona-
liter analoga cum ſolido A B C H G, primæ. Sed
ſolidum A B C H G, primæ eſt proportionalit
reuoluta circa C F, duo vero media ſint illa, quæ
oriuntur ex reuolutione ſemiparabolæ A B D, cir-
ca baſim B D, nempe ſint duo ſemifuſi parabolici
ex data ſemiparabola. Ex propoſit. anteced. con-
ſtat quatuor ſolida ſecundæ figuræ eſſe proportiona-
liter analoga cum ſolido A B C H G, primæ. Sed
ſolidum A B C H G, primæ eſt proportionalit