If an isosceles triangle $ABC$ in which $AB = AC$ = 6 cm is inscribed in a circle of radius 9 cm, then the area of the triangle $ABC$ is _______

Question

$\begin{array}{1 1} (a)\; 8\;cm \\ (b)\; 8\sqrt{2}\;cm \\ (c)\; 8\sqrt{3}\;cm \\ (d)\; \text{none of the above} \end{array}$