Find the area of the shaded region in figure 4, where a circular arc of radius 6 cm has been drawn with vertex O of an equilateral triangle OAB of side 12 cm as centre and a sector of circle of radius 6 cm with centre B is made.
Figure- It has a circle (fully shaded) and with the sector there is a triangle which is shaded except for a sector at the corner with B as centre.
Is the answer (627/7 + 9 root 3) sq. cm. ??