Question 4137
 This question is not quite clear.

 I think the largest base circle has radus r =4 cm ( with diameter 8 cm)
 and the height of the right ciecular cone is h = 8 cm.

 Hence, the volume of the cone is pi r^2 h /3 = 128 pi/ 3 cm^3
 (the approximated value is left for you if necessary.)

 Kenny