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# What is the length of each side of a square, if its diagonal is 15 ?

$\begin{array}{1 1} (a)\; \frac{16}{\sqrt{2}} \\ (b)\; \frac{15}{\sqrt{2}} \\ (c)\; \frac{13}{\sqrt{2}} \\ (d)\; \frac{14}{\sqrt{2}}\end{array}$