如果一个等腰三角形的底边长是周长的
,那么它的一个底角的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ffd5c35bba71ea54c28622b6cf505d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
11-12高二上·湖北武汉·期末 查看更多[1]
(已下线)2011年湖北省武汉市三角路中学高二上学期期末考试数学理卷
更新时间:2011-03-04 14:06:42
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【推荐1】
中,
,
,
,则
的角平分线
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】
的内角
、
、
的对边分别为
、
、
,已知
,该三角形的面积为
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9178fc8b5d65aa75fa9196294a0db7e.png)
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