Question 914501
h, height of the cylinder
y, height of the cone:  {{{0<y<=h}}}
r, radius of the cylinder
r/2, radius of the cone


volume of remaining solid is vol of cylinder minus vol of cone.
{{{h(pi)r^2-(1/3)y(pi)(r/2)^2}}}
Simplify, and then substitute the values.  Evaluate.