21-22七年级上·全国·课后作业
1 . 如图所示,将两块三角尺的直角顶点重合.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/483e4f10-2509-41a0-a8a0-d1e71e32ac7a.png?resizew=134)
(1)写出以C为顶点的相等的角;
(2)若
,求
的度数;
(3)写出
与
之间所具有的数量关系;
(4)当三角尺
不动,将三角尺
的EC边与AC边重合,然后绕点C按顺时针或逆时针方向任意转动一个角度,当
(
)等于多少度时,这两块三角尺各有一条边互相垂直,直接写出
角度的所有可能值,不用说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/483e4f10-2509-41a0-a8a0-d1e71e32ac7a.png?resizew=134)
(1)写出以C为顶点的相等的角;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ad9b1e635979596375d8b804de3216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384d0a02d097ac7aa8a19e8da6f9767.png)
(3)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384d0a02d097ac7aa8a19e8da6f9767.png)
(4)当三角尺
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/245da9d7b9455777dfffb6298e66664e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c141dbfd47ba2f842681cf3e22263bc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
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