# $ABC$ is a triangle with $\angle A=30^{\large\circ}$ $BC=10$cm.The area of the circumcircle of the $\Delta$le is?
$\begin{array}{1 1}(a)\;100\pi sqcm&(b)\;5sqcm\\(c)\;25sqcm&(d)\;\large\frac{100\pi}{3}\normalsize sqcm\end{array}$