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(1)12r2=5,所以r2=10,3.14×10=31.4(平方釐米),答:這個圓的面積是31.4平方釐米.(2)2r×r÷2=5,所以r2=5,3.14×5=15.7(平方釐米),答:這個圓的面積是15.7平方釐米.
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