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【OG20-P276-271题】
Square ABCD is inscribed in circle O. What is the area of square region ABCD?
(1) The area of circular region O is 64.
(2) The circumference of circle O is 16.
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圆的半径:内接正方形边长:外切正方形边长=1:√2:2
条件1:已知圆的面积可以求出半径r,内接正方形的边长也就可以求出来,充分;
条件2:已知圆的周长可以求出半径r,内接正方形的边长也就可以求出来,充分
题目讨论 (2条评论)

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Crystal8
inscribe 基本上就是在说是内切了,我以为不一定内切,所以就觉得两个都不会充分!记住这个词的意思
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0 回复 2021-11-19 13:00:30
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猪猪精上740
square是正方形一定注意
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0 回复 2019-10-13 11:40:34