hl). e 260 per m². (Ignore the doors, windows and other 300 m. Calculate the cost of Find thronurved surface area and the total surface area of a cylinder with the following (1) Radius of the base = 7 cm and height = 12 cm (ii) Radius of the base = 15 cm and height = 35 cm (iii) Diameter of the base = 21 m and height = 7 m (iv) Diameter of the base = 1.4 m and height = 5 m 15. A closed cylindrical tank of diameter 21 m and height 4 m is made of steel. How much area of steel sheet is required? 16. Find the curved surface area and the total surface area of a cylinder whose (1) volume is 30800 cm³ and radius of the base is 14 cm. (1) volume is 1.54 m³ and radius of the base is 70 cm. 17. Find the curved surface area and the total surface area of a cylinder if (1) its volume is 23562 cm³ and height is 17 cm. (ii) its volume is 1078 cm³ and height is 7 cm. 18. The total surface area of a cylinder is 924 cm². If its radius of the base is 7 cm, find its height and volume. 19. The lateral surface area of a cylinder of height 21 cm is 924 cm². Find its radius of the base and its volume. 20. The curved surface area of a cylinder is 6160 cm² and the circumference of the base is 176 cm. Find the volume of the cylinder. 21. The radius and the height of a cylinder are in the ratio 7: 3. If the volume of the cylinder is 12474 cm³, find the curved surface area and the total surface area of the cylinder. 22. Find the cost of painting 20 cylindrical pillars of an institution at the rate of 3 per m² if the radius and the height of each pillar are 36 cm and 3.5 m respectively.
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