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three layer concrete cylindrical structure was build in a school for erecting the flag post the ground layer is of diameter 154 cm and height 25 cm, the middle layer is of diameter 98 cm and height 25 cm and the top layer is of diameter 42 cm  and height 25 cm  find the total surface area of whole structure

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Written on April 17, 2017, 8:32 p.m.