Copper has the fcc crystal structure.Assuming an atomic radius of 130pm for copper atom (Cu = 63.54).What is the length of unit cell of Cu?

Question

$\begin{array}{1 1}3.6769\times 10^{-8}cm\\2.6769\times 10^{-8}cm\\1.6769\times 10^{-8}cm\\4.6769\times 10^{-8}cm\end{array} $