Question

27. If Vis the volume and Sis the surface area of cuboid with dimensions a x b x c, prove that S a + h ~. c V . 2(1 I ') I 28. A right circular cylindrical vessel of diameter 2 m and length 40 m is to be constructed from a sheet of iron. Find the area of the iron sheet required in m2. 29. A cylindrical roller has a radius of20 cm and is 77 cm long. Find the area levelled by this roller in 500 revolution;. 30. If the lateral surface of a cylinder of height 5 cm is 94.2 cm2, then find (i) Radius of the base (ii) Volume of the cylinder. (Take n = 3 .14) 3 I. The volume of a cy I inder is 1540 cm3• If it is IO cm I ong, find the (i) radius of the base (ii) curved surf ace arc (iii) total surface (Take n = 22/7) 32. The area of the curved surface of a cylinder is 4400 cm2 and the circumference of its base is 110 cm. Find (i) Height of the cylinder (ii) The volume of the cylinder​

Answer 1

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