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在一個圓內話一個最大的正方形,只告訴你這個正方形邊長10釐米,怎樣求這個圓的面積? 分析: 因為正方形的面積可以是邊長乘邊長,也可以是對角線乘對角線的一半,而對角線是2r.所以正方形的面積: (2r)*(2r)/2=10*10 r^=50 所以圓面積:r^*3.14=50*3.14=157平方釐米
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