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Pp=πr^2
Pb=2πrh
V=Pp*h
2*Pp=Pc-Pb
2*Pp=216-144=72
Pp=36π cm
r=6 cm
Pb=2πrh
Pb=2*π*6*h
6*2=12,
h=144/12=12
h=12
V=Pp*h
V=36π cm^2 * 12cm =432π cm^3