题目内容

(本小题满分10分)
中,
(Ⅰ)求的值;
(Ⅱ)设的面积,求的长。
(Ⅰ)
(Ⅱ)
(Ⅰ)由,得
,得
所以。·································· 5分
(Ⅱ)由
由(Ⅰ)知
,·················································································· 8分


所以。   10分
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