Two sides of a given triangle are both 6 cm. If one of the angle is right angle, what is the measure of the hypotenuse ?

Question

$\begin{array}{1 1} (a)\; 5 \sqrt{2} \\ (b)\; 4 \sqrt{2} \\ (c) 6 \sqrt{2} \\ (d)\; \sqrt{2} \end{array}$