1. (a)The ratio of the base radii of two right circular cones of the same height is 3 : 4. Find the ratio of their volumes.9:16
(b) The ratio of the heights of two right circular cones is 5 : 2 and that of their base radii in 2:5. Find the ratio of their volumes. Ans2:5
(c) The height and the radius of the base of a right circular cone is half the corresponding height and radius of another bigger cone. Find :(i) the ratio of their volumes. (ii) the ratio of their lateral surface areas. Ans 1:8 , 1:4
2. An open cylindrical vessel is made of a metal. The internal diameter is 7 cm, the internal depth is 10 cm and the metal is 5 mm thick. Calculate
(i) the capacity of the vessel (ii) the volume of the metal. Ans: 385,143
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