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題目意思就是說要在以個正方形紙片裏剪一個圓,所以要求出圓的直徑,然後直徑其實就是正方形的邊長,再用邊長^2求面積 直徑是:根號(9.42/3.14)*2 =2個根號3 那麼正方形面積是:2個根號3的平方=12 cm^2
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