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"8. From a solid cylinder whose height is 2.4\\( \\mathrm { cm } \\) and diameter \\( 1.4 \\mathrm { cm } , \\) a conical cavity of the\nsame height and same diameter is hollowed out. Find the total surface area of the\nremaining solid to the rearest \\( \\mathrm { cm } ^ { 2 } \\) ."

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