$\begin{array}{1 1} (a)\; \text{The volume of a sphere of radius V is equal to one third of the volume of a cylinder of radius V where height is equal to double the diameter of the sphere.} \\ (b)\; \text{If a solid sphere of radius 'a' is converted into a cone having its radius equals to the side of the cone then the height of the cone is twice its diameter.} \\ (c)\; \text{If diagonal of a cube is 9 m then volume of the cube is 81 $m^3$} \\ (d)\; \text{All of the above} \end{array}$
