(a)[2]
Find $h$ in terms of $r$.
(b)[2]
The cone's slant height can be written as $r\sqrt{k}$ cm, where $k$ is an integer. Find the value of $k$.
(c)[1]
Find an expression, in terms of $r$ and $\pi$, for the total surface area, in $\text{cm}^2$, of the solid.