A hemispherical bowl is made of steel, 0.25 cm thick. The inner radius of the bowl is 5 cm. Find the outer curved surface area of the bowl.

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 3.5 cm, height 12 cm.

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