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正方形的面積=對角線平方÷2 10x10÷2=50cm2 正方形的面積是50平方釐米
正方形最大,則對角線長即為直徑10cm ∴S正方形=對角線×對角線/2=50平方釐米 hjjhxrz來自數學輔導團團隊
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