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(2008•临夏州)已知等腰三角形的一条腰长是5,底边长是6,则它底边上的高为 ...
(2008•临夏州)已知等腰三角形的一条腰长是5,底边长是6,则它底边上的高为 .
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(2008•厦门)如图,点G是△ABC的重心,CG的延长线交AB于D,GA=5cm,GC=4cm,GB=3cm,将△ADG绕点D旋转180°得到△BDE,则DE=
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2.
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(2008•湛江)下面的图形中,是中心对称图形的是( )
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(2012•河源)下列图形中是轴对称图形的是( )
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若将图中的每个字母都看成独立的图案,则这七个图案中是中心对称图形的有( )
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A.1个
B.2个
C.3个
D.4个
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