In the $BCC$ lattice structure with $a=1\mathrm{.}528A$ :

a$)$ Find the planar density of the $([1,1,1])$ plane in terms of atoms $\frac{?}{c{m}^2}?$

b$)$ Find the linear densities of $\left[\begin{array}{ccc}1& 1& 1\end{array}\right]$ and $\left[\begin{array}{ccc}1& 0& 0\end{array}\right]$ directions in terms of atoms $\frac{?}{cm}.$