CHAPTER 20 CYLINDER CONES CONCISE MATHEMATICS SELINA SOLUTIONS EX 20 B

 

Q11. Find the area of the canvas required to make a conical tent 14 m high and 96 m in diameter. Given that : (i) 20% of the canvas is used in folds and stitching. (ii) canvas used in folds and stitching is 20% of the curved surface area of the tent.  

 

Q10. A vessel, in the form of an inverted cone, is filled with water to the brim. Its height is 20 cm and diameter is 16.8 cm. Two equal solid cones are dropped in it so that they are fully submerged. As a result, one-third of the water in the original cone overflows. What is the volume of each of the solid cones submerged ? 

 

Q8. The ratio of the base area and the curved surface area of a conical tent is 40 : 41. If its height is 18 m, find the air capacity of the tent in terms of π.