题目内容
(本小题满分10分)
在中,,。
(Ⅰ)求的值;
(Ⅱ)设的面积,求的长。
在中,,。
(Ⅰ)求的值;
(Ⅱ)设的面积,求的长。
(Ⅰ)
(Ⅱ)
(Ⅱ)
(Ⅰ)由,得,
由,得。
所以。·································· 5分
(Ⅱ)由得,
由(Ⅰ)知,
故,·················································································· 8分
又,
故,。
所以。 10分
由,得。
所以。·································· 5分
(Ⅱ)由得,
由(Ⅰ)知,
故,·················································································· 8分
又,
故,。
所以。 10分
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