如图,在四边形ABCD中,DE是AD的延长线,已知AC平分∠DAB,AB∥CD,∠1=40°.求证:∠2=80°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/31e924ed-5ecf-4ec3-8d42-0ebf0a2db4e3.png?resizew=165)
更新时间:2022-08-06 02:00:38
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【推荐1】如图,点
在直线
上,
与
互补,
平分
.
![](https://img.xkw.com/dksih/QBM/2021/1/22/2641642233266176/2643641823674368/STEM/62a72361867b489c9884db92d0fc85fe.png?resizew=179)
(1)若
,则
的度数为 ;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://img.xkw.com/dksih/QBM/2021/1/22/2641642233266176/2643641823674368/STEM/62a72361867b489c9884db92d0fc85fe.png?resizew=179)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a71bb53109aab57cf279b83839386d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbee6d5731d6f4bb1e4f2ba3d89b7dc.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c824bdda274c3f66709f61eb501e837e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
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【推荐2】如图,∠AOD=70°,∠COD=20°,OB是∠AOC的平分线,求∠AOB的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/2/0f8b7428-9c29-4727-b83f-04c741b0fe0c.png?resizew=140)
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【推荐1】如图,直线AB∥CD,∠C=44°,∠E为直角,求∠1的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/22/5cca3627-d4ff-4a13-b5ef-fba736d400f7.png?resizew=129)
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【推荐2】把一张长方形纸片
沿
折叠后
与
的交点为
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分别在
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