Question 1027129
The volume of a cylinder of radius {{{r}}} and height {{{h}}} is
{{{V[cyl]=pi*r^2*h}}} .
 
The volume of the cylinder of radius {{{3}}}{{{inches}}} and height {{{8}}}{{{inches}}} is
{{{pi*3^2*8}}}{{{in^3=72pi}}}{{{in^3}}} .
 
The volume of the removed cylinder of radius {{{2}}}{{{inches}}} and height {{{8}}}{{{inches}}} is
{{{pi*2^2*8}}}{{{in^3=32pi}}}{{{in^3}}} .
 
The volume of the roller is
{{{72in^3-32in^3=highlight(40in^3)}}}