任意四边形的中点四边形是______ 形.
更新时间:2022-07-27 16:37:35
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【推荐1】如图所示,AB,CD是两条相交的线段,O分别是它们的中点,当线段DC绕点O旋转时(DC,AB不重合),连接AC,CB,BD,DA所得到的四边形ACBD始终是________ .理由是_________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/e530e4e8-a9cc-42c5-829b-abefc461521d.png?resizew=117)
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【推荐2】定理“平行四边形的对角相等”的逆命题是________________ .
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【推荐1】如图,在四边形
中,点
、
分别是
、
边的中点,
,
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的长为______ .
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【推荐2】如图,在四边形
中,E、F分别是
、
的中点,G、H分别是
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的中点,依次连接E、G、F、H得到四边形为________ 形.
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【推荐1】已知四边形ABCD的对角线互相垂直,顺次连接四边形的四条边中点,所得到的新四边形的形状是________ .
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【推荐2】E,F,G,H分别为四边形
的边
,
,
,
的中点,则四边形
的形状是______ ,当
与
满足条件______ 时,四边形
是矩形.
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