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12.56÷3.14÷2=2(釐米)2×2=4(釐米)3.14×(42-22)=3.14×(16-4)=3.14×12=37.68(平方釐米)答:它的半徑是2釐米,面積新增37.68平方釐米.故答案為:2;37.68.
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