When a sphere is cut into 2 pieces, two identical pieces are formed. This one of the pieces is called as ‘Biggest piece’.

Out of 2 pieces, one piece is kept aside and other piece is again cut in a symmetrical manner to get two other identical pieces which have same shape as that before cutting.

Now, once again one piece is kept aside and other piece is cut in a symmetrical manner to get two other identical pieces. This one of pieces is called as ‘Smallest piece’.

Let diameter of the sphere = 2

*a*Now, Area of the biggest piece = Area of plane circular part + Area of the spherical part

= 3π

*a*^{2}Area of the smallest piece = (3 × Area of the plane quarter part) + Area of the spherical part

Hence, option 4.