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水桶底面半徑3/2=1.5dm,底面積1.5平方x3.14=7.065dm2,底面周長3x3.14=9.42cm,側面積9.42x4=37.68dm2 所以表面積37.68+7.065=44.745dm2 做一個這樣的水桶至少需要鐵皮44.745dm2
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