In the diagram given below, the circle with centre $A$ has an area of $154 \; sq. unit$. What is the area with centre $B$? <br>

Question

$\begin{array}{1 1} (a)\; 49 \pi \\ (b)\; \frac{49 \pi}{2} \\ (c)\; \frac{49 \pi}{4} \\ (d) \frac{49 \pi}{16} \end{array}$