Formula for volue of cylinder is area time height. Lets find area A=[tex] \pi r^2[/tex] diameter=2r 8=2r r=4 Now substitute r to [tex]A= \pi r^2[/tex] A=[tex] \pi 4^2= 16\pi [/tex] Now we have formula V=[tex]16 \pi *height=16 \pi *9=144 \pi [/tex] - its the result, so B
