如图,在△ABC中,∠B=80°,∠C=40°,AD⊥BC于点D,AE平分∠BAC,则∠DAE=____ °
![](https://img.xkw.com/dksih/QBM/2019/4/25/2189862797082624/2191715410984960/STEM/173ce320-6697-4702-8bc0-f7209d1408fa.png?resizew=303)
更新时间:2019-04-27 23:19:19
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【推荐1】如图,在△ABC中,∠BAC=90°,点D在BC上,且BD=BA,点E在BC的延长线上,且CE=CA,则∠DAE的大小为___ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/8b4b9067-6883-489a-affe-18a6623ad741.png?resizew=183)
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【推荐1】小芳和小林为了研究图中“跑到画板外面去的两直线a,b所成的角(锐角)”问题,设计出如下两个方案:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/803dbfa8-dda0-4221-8fda-bb5ef8e5cf19.png?resizew=261)
现在小林只测得∠β=115°,小芳作了AB=BC,并只测得∠1=80°,请你根据以上信息求出直线a,b所成角的度数______ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/803dbfa8-dda0-4221-8fda-bb5ef8e5cf19.png?resizew=261)
小林的方案 | 小芳的方案 |
测α,β的度数 | 测 |
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【推荐2】如图,已知
,
,点
在射线
上,且
,则
的度数为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/204c52d0b7700f996954f3d02c2e6954.png)
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【推荐1】如图,在
中,
和
的平分线相交于点P,若
,则
的度数为_________ .
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【推荐2】如图,在
中,
平分
交
于点D,
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交
于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/b20820d3-d2ee-430d-9434-f8d8d08599d9.png?resizew=172)
(1)若
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(2)若
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的度数为___________ ;
(3)猜想
与
的数量关系为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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(1)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0be186da1b75b78aa39b8cdbe9438a6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(3)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
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