190. Kesik konus hajmi

$ABCD$ trapetsiyaning $B$ va $C$ burchaklari to'g'ri. $AB=8$, $BC=6$ va $CD=2$. Bu trapetsiyani $BC$ tomon atrofida $360^{\circ }$ ga aylantirganda hosil bo'lgan jismning hajmi $V_1$ ga, $AB$ tomon atrofida $360^{\circ }$ ga aylantirganda hosil bo'lgan jismning hajmi $V_2$ ga teng. $V_1-V_2$ ni toping.