如图,平行四边形ABCD中,对角线AC,BD相交于点O,点E,F分别是OB,OD的中点.
(1)试说明四边形AECF是平行四边形.
(2)若AC=2,AB=1.若AC⊥AB,求线段BD的长.
(1)试说明四边形AECF是平行四边形.
(2)若AC=2,AB=1.若AC⊥AB,求线段BD的长.
![](https://img.xkw.com/dksih/QBM/2019/6/26/2233908636082176/2235181009485824/STEM/36e62a38c2c04086a30dfa5e0f9e421b.png?resizew=203)
更新时间:2019-06-28 09:10:18
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【知识点】 证明四边形是平行四边形解读
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解答题-证明题
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适中
(0.65)
名校
【推荐1】如图,
中,
是
边上任意一点,
是
中点,过点
作
交
的延长线于点
,连接
,
.
是平行四边形;
(2)若
,
,
,
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解答题-证明题
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适中
(0.65)
名校
【推荐2】如图,在
中,点
是
的中点,点
是线段
延长线上一动点,连接
,过点
作
的平行线
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的延长线交于点
,连接
、
.
是平行四边形.
(2)若
,
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②当
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①当
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②当
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