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設r為x 2πr=4π r=2 s圓形=πr^2 =4π =12.56
可根據公式:圓的周長=2∏r.將周長60代入公式可得出:60=2∏r,所以,r=60÷∏÷2 2 再根據圓的面積=∏r可求出圓的面積 2 列式:(60÷2÷∏)*∏ 2 如果你們把π約成3.14,列式為:(60÷2÷3.14)*3.14
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