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【分析與解答】環形的面積應該用大圓的面積减去小圓的面積.但分別求出大、小圓的面積是不可能的.圖中陰影部分的面積就是大正方形面積一小正方形面積. 即R2-r2=50cm2 環形面積=лR2-лr2 =л(R2-r2) =50л =157(cm2)
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