For face centered cubic structure edge length ' \( a \) ' can be related with radius ' \( r \) '...

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For face centered cubic structure edge length ' \( a \) ' can be related with radius ' \( r \) ' as
(1) \( a=r \times \sqrt{2} \)
(2) \( a=r \)
(3) \( a=2 \sqrt{2} r \)
(4) \( a=\frac{4}{\sqrt{3}} r \)
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