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

$\begin{array}{1 1} 8\; cm \\ 8 \sqrt 2\;cm \\8 \sqrt 3\;cm \\ \text {none of the above} \end{array}$