如图:已知:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc8444d63d1ca92651c62fe9b220859.png)
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc8444d63d1ca92651c62fe9b220859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73cc67ce117a5118a9b3f88b543f66fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c4c3c0a34dc21292fa32befd58d8f82.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/d02a5c17-323f-4b44-abbb-b9a2ae1f5cdf.png?resizew=114)
更新时间:2024-03-12 16:55:32
|
【知识点】 根据平行线判定与性质求角度解读
相似题推荐
解答题-问答题
|
较易
(0.85)
【推荐1】综合与实践
问题情境:在数学课上,老师呈现了这样一个问题:
如图,已知
,
于点
,
交
于点
,当
时,求
的度数.
交流分享:勤思组的甲、乙、丙三位同学通过添加不同的辅助线均解决了问题,如下图:
合作提升:完成下列问题:
(1)请根据甲同学的图形,完成下列推理过程:
解:过点
作![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50ad37ec422c740ff3ab61f0898ce922.png)
∴
__________
( )
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
∴
( )
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50ad37ec422c740ff3ab61f0898ce922.png)
∴
( )
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f09d69cd605cc71111cea7e866b2e91.png)
∴
___________=___________°
(2)请仔细观察乙、丙两位同学所画图形,选择其中一个,求
的度数.
问题情境:在数学课上,老师呈现了这样一个问题:
如图,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54ccc7d2f8af35a252977d6e2af4663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ca0ea573af39647bbb44977ed1eeb2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/29/f18f9a4b-8dda-40de-8122-ba07c0c6e246.png?resizew=171)
交流分享:勤思组的甲、乙、丙三位同学通过添加不同的辅助线均解决了问题,如下图:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/29/3ee3186c-f4e5-4ee7-9e8b-8a700e5400de.png?resizew=167)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/29/972fc135-2a8f-4f5c-95e1-17e6c23065b8.png?resizew=197)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/29/9e8f72c1-4013-48d8-893e-b3339352f634.png?resizew=176)
合作提升:完成下列问题:
(1)请根据甲同学的图形,完成下列推理过程:
解:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50ad37ec422c740ff3ab61f0898ce922.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/665ffcdb7c57534dc184cc840471f2f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dae4f15a7e9b502bd9f01a694260d5ea.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4026e1474de64d6c8ad07ea7f841cd7f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50ad37ec422c740ff3ab61f0898ce922.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3066befa5750964166ddc008f247b13.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f09d69cd605cc71111cea7e866b2e91.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/710ecda2bb0a024f62b4b51fd179a18b.png)
(2)请仔细观察乙、丙两位同学所画图形,选择其中一个,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ca0ea573af39647bbb44977ed1eeb2.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐2】已知
,点
是
上一点,
平分
交
于点
.
,求
的度数;
(2)如图2,若
平分
,
,
,判断
与
之间的位置关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd1bc0388e7fad3e849ca39c67f5034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e32f49aeb35feadbdd83b2b4cf3ee955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33baaa05c04f6b132fc97dd0930cf44c.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557a10ef089d8bfbff1115e84a52b0e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d8383cd1cf1c68fb2ce8f53b403bad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f83caec15b29e981a22a5536dc92bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次