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外接球的半徑當然不是2分之根號2 可以用直徑來考慮比較簡單, 面的對角線長度是跟號2,那麼正方體的對角線即是根號(根號2^2+1^2)=根號3 半徑就是2分之根號3 同理即可得出內切球體的半徑為2分之根號2 那麼體積比就是半徑比的3次方, 外接比內切等於3根號3比2根號2
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