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首先措辭問題:他不是設H̅B̅=x²他用「則」所以是推導出來的喔
由題目可以知道矩形CFGH,HGEB,FDAE,CDAB長:寬相等⇒CFGH,~HGEB~FDAE~CDAB
1 : x = x : H̅B̅ ⇒ H̅B̅ = x² ⋯⋯ 由CFGH ~ HGEB

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