如图,在平行四边形ABCD中,对角线AC、BD交于点O,BD=2AD,点E、F、G分别是OA、OB、CD的中点,EG交FD于点H,则①ED⊥CA;②EF=EG;③
;④
.上述4个结论中说法正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/f875a4cb-bc17-497c-baac-e96f3d2d9d14.png?resizew=170)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef7c4e67fcd0cb85c38693f78a2442d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/051701133a1ff036cbb39d582e1269dc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/f875a4cb-bc17-497c-baac-e96f3d2d9d14.png?resizew=170)
A.①② | B.①②③ | C.①③④ | D.①②③④ |
19-20八年级下·浙江宁波·期末 查看更多[7]
浙江省宁波市镇海区2019-2020学年八年级下学期期末数学试题江苏省南京市鼓楼区金陵汇文学校2020-2021学年八年级下学期05月月考数学试题江苏省宿迁市沭阳县2021-2022学年八年级下学期第一次月考数学试题(已下线)专题18.8 平行四边形的判定(培优篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(人教版)(已下线)专题4.14 平行四边形的判定定理(培优篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(浙教版)(已下线)专题19.11 平行四边形的判定(培优篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(沪科版)(已下线)专题6.8 平行四边形的判定(培优篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(北师大版)
更新时间:2021-07-20 20:48:00
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【推荐1】如图,△ABC的面积为30cm2,AE=ED,BD=2DC,则图中四边形EDCF的面积等于( )
A.8.5 | B.8 | C.9.5 | D.9 |
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【推荐2】如图,在
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,
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的面积为
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的面积为( )
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A.60 | B.56 | C.70 | D.48 |
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【推荐1】如图,在
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的中点,
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;②
;③
;④
,其中正确的有( )个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】如图, 在△DAE中, ∠DAE=40°, B、C两点在直线DE上,且∠BAE=∠BEA,∠CAD=∠CDA,则∠BAC的大小是( )
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A.100° | B.90° | C.80° | D.120° |
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【推荐1】如图,两块完全相同的含
角的直角三角板
和
叠合在一起,将三角板
绕直角顶点
按逆时针方向旋转角
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①当
时,
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②当
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①当
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②当
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③在旋转过程中,存在某一时刻,使得
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共中结论正确的有多少个( )
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【推荐2】已知等边三角形ABC的边长为12,点P为AC上一点,点D在CB的延长线上,且BD=AP,连接PD交AB于点E,PE⊥AB于点F,则线段EF的长为( )
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【推荐1】如图,在正方形
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重合),对角线
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,过点
分别作
、
的垂线,分别交
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于点
、
,交
、
于点
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,下列结论:
①
;
②
;
③
;
④当
是
的中点时,
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其中正确的结论有( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c48a17f8cb89cf6bf4388b9f269c60b9.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebd0ea3041ca1f3d64fc640c64f8ed89.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1deb3ba2e791c88e551ca06ebccf6eb.png)
④当
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其中正确的结论有( )
A.![]() | B.![]() | C.![]() | D.![]() |
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/23/b3ecec7e-d075-4171-9e65-f26eee9ac626.png?resizew=175)
A.![]() | B.![]() | C.![]() | D.5 |
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