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在圓裡面畫一個面積最大的正方形,那麼這個正方形的對角線應該等於圓的直徑 圓的半徑=√15.7/3.14=√5釐米 所以正方形的對角線=2√5釐米=√20釐米 正方形的面積=對角線的平方/2=√20*√20/2=10平方釐米
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