如图,已知线段
及线段
外一点C,要求过点C作直线
,使直线
⊥直线
.
小欣的作法如下:①以点B为圆心,BC长为半径作弧;
②以点A为圆心,
长为半径作弧,与①中的弧交于另一点D;
③作直线
,则直线
即为所求.小明对小欣的作法进行了证明.
证明:连接
,
.
∵
☆________,∴点△________在线段
的垂直平分线上(◎________)(填推理的依据).
∵
,∴点□________在线段
的垂直平分线上,
∴直线
为线段
的垂直平分线,∴
.下列表示正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
小欣的作法如下:①以点B为圆心,BC长为半径作弧;
②以点A为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
③作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e1ecefcd888e9495e9b3f549bff82ef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/20/2b1a3f72-16c5-4a79-a45c-17195e97f1e7.png?resizew=209)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ee81929c987732fcb379802eeef7a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
∴直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
A.☆表示![]() | B.△表示D | C.◎表示线段垂直平分线上的点到线段两端的距离相等 | D.□表示A |
更新时间:2023-09-22 11:14:01
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