Question 941782
volume of the cylinder  = {{{  12*pi}}} cm^3
formula : volume of the cylinder (v) ={{{ pi*r^2*h}}}
 now radius becomes 3r , and height becomes 2h
 hence substitute r=3r , h= 2h in the above formula
           New Volume  = {{{ pi*(3r)^2*(2h)}}}
                = {{{ pi*9r^2*2h}}}
                 = {{{18*pi*r^2*h}}}
           = 18* original volume 
           = {{{ 18*12*pi}}}
 = {{{216*pi}}}
 Result: {{{216*pi}}}