解题方法
1 . 如图1,在
中,
平分
,
平分
.
(1)若
,则
的度数为______;
(2)若
,直线
经过点
.
①如图2,若
,求
的度数(用含
的代数式表示);
②如图3,若
绕点
旋转,分别交线段
于点
,试问在旋转过程中
的度数是否会发生改变?若不变,求出
的度数(用含
的代数式表示),若改变,请说明理由:
③如图4,继续旋转直线
,与线段
交于点
,与
的延长线交于点
,请直接写出
与
的关系(用含
的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8793053fbb2ac5a3122b092a575124.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd465973943bcd766b5275ee204bbf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
①如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d24e554db06a587a517a1901be12601a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ccccde1e0a4d6d69853c297b1307b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
②如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cca04b2a2b61d62a809776670a60c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ccccde1e0a4d6d69853c297b1307b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ccccde1e0a4d6d69853c297b1307b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
③如图4,继续旋转直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/474e47a4679cace57ffd2b870f5b13a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e265894011c2b93ce5a5fa9fab2b9982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/2020/5/20/2466844930850816/2467681324179456/STEM/c82909bae4294055bc56c97160da31d5.png?resizew=512)
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2 . 如图,把一块直角三角板的直角顶点放在直尺的一边上.若
,则
的度数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7053457334966d5eeae2408ad0347b9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
A.22° | B.32° | C.42° | D.52° |
您最近一年使用:0次
2019-11-14更新
|
159次组卷
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3卷引用:甘肃省陇南市礼县礼县第一中学2023-2024学年七年级下学期期中数学试题