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半圓的半徑是:25.7÷(3.14+2),=25.7÷5.14,=5(釐米);所以半圓的面積是:3.14×52÷2=39.25(平方釐米);答:它的面積是39.25平方釐米.
周長:直徑x3.14,面積:半徑平方x3.14
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