31.4dm=314cm
底面周长是314cm,所以半径为(314*3.14)*2=50cm
所以底面积为50平方*3.14=7850平方厘
侧面积为314*10=3140平方厘米
表面积为7850*2+3140=18840平方厘米=188.4平方分米
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