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如图,在菱形ABCD中,∠ABC=60°,AC=4,则BD的长为( ) A. B...
如图,在菱形ABCD中,∠ABC=60°,AC=4,则BD的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825020_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825020_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825020_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102724095182576/SYS201311031027240951825020_ST/2.png)
D.8
考点分析:
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如图,△ABC中,∠C=90°,AC=16cm,AB的中垂线MN交AC于点D,连接BD,若cos∠BDC=
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