SOLUTION: the external dimension of a closed cylindrical watertank made of concrete materials consist of its radius which is 3 meters and height is 8 meters.if the thinkness of the concrete

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Question 1002227: the external dimension of a closed cylindrical watertank made of concrete materials consist of its radius which is 3 meters and height is 8 meters.if the thinkness of the concrete walls is 1 decimeter,find the volume of the concrete walls to the nearest m3
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