A right circular cylinder just encloses a sphere of radius r. Find

(i) surface area of the sphere,

(ii) curved surface area of the cylinder,

(iii) ratio of the areas obtained in (i) and (ii).

Find the volume of the right circular cone with radius 6 cm, height 7 cm.

Find the capacity in litres of a conical vessel with radius 7 cm, slant height 25 cm.

Find the capacity in litres of a conical vessel with height 12 cm, slant height 13 cm.