In the given figure\[AB=BC=CD=4\,\,cm.\]Whereas the unshaded portion in the upper semicircles is a semicircle with radius BC and center at C. Find the ratio of the area of the shaded region to that the unshaded region.

In the given figure\[AB=BC=CD=4\,\,cm.\]Whereas the unshaded portion i

1.	In the given figure\[AB=BC=CD=4\,\,cm.\]Whereas the unshaded portion in the upper semicircles is a semicircle with radius BC and center at C. Find the ratio of the area of the shaded region to that the unshaded region.
A.	\[4:13\]
B.	\[2:5\]
C.	\[6:13\]
D.	\[9:13\]
Answer» C. \[6:13\]