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The figure below represents a hollow cylinder.The internal and external radii are estimated to be 6 cm and 8 cm respectively ,to the nearest whole number.The height of the cylinder is exactly 14 cm
(a) Determine the exact values for internal and external radii which will give maximum volume of the material used.
(b) Calculate the maximum possible volume of the material used. ( Take the value of #pi# to be #22/7# )