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圓的周長:6.28×2=12.56(分米);圓的面積:3.14×(12.56÷3.14÷2)2=3.14×4,=12.56(平方分米).答:這個圓的面積是12.56平方分米,周長是12.56分米.故答案為:12.56,12.56.
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