In a triangle $\mathrm{ABC}, \mathrm{AB}=\mathrm{AC}=8 \mathrm{cm}$ . A circle drawn with $\mathrm{BC}$ as diameter passes through $\mathrm{A}$ . Another circle drawn with center at A passes through B and $\mathrm{C}$ . Then the area, in sq. $\mathrm{cm}$ , of the overlapping region between the two circles is