Find the area of the shaded region in given Fig. where arcs drawn with centres A, B, C and D intersect in pairs at mid-points P, Q, R and S of the sides AB, BC, CD and DA, respectively of a square ABCD (Use =3.14). B D 30.96 cm 90.96 cm 120.96 cm 180.96 cm S D a R B O C 12 cm