尺规作图:过直线外一点作已知直线的垂线.
已知:如图1所示,直线l及直线外一点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/b6ec62d5-2054-40fa-8905-a33858c0351a.png?resizew=407)
求作:直线l的垂线
.
作法:(1)如图2,在直线l上选取点A,连接
;
(2)以点P为圆心,线段
的长为半径作弧,此弧与直线l交于点B(不与点A重合);
(3)分别以,点A、点B为圆心,以线段
的长为半径画弧,两弧在直线l下方交于点C;
(4)作直线
;
则直线
就是所求作的直线l的垂线.
(1)请你根据作法用尺规将图2补全,保留作图痕迹;
(2)补全以下证明过程:连接
,由题意可知
,
∴四边形
是_________形(_______________)
∴
(_____________________)
即直线
.
已知:如图1所示,直线l及直线外一点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/b6ec62d5-2054-40fa-8905-a33858c0351a.png?resizew=407)
求作:直线l的垂线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
作法:(1)如图2,在直线l上选取点A,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
(2)以点P为圆心,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
(3)分别以,点A、点B为圆心,以线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
(4)作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
则直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(1)请你根据作法用尺规将图2补全,保留作图痕迹;
(2)补全以下证明过程:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f34e1a20bdd09c011d3dcda0edad1a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969e69e3b706faded84be15f54b2cdd8.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/283b0cef5d644b8dceb910ce2c76f21c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e4b16c2c6c9bd089da78122e9d2511.png)
即直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a67cf9efc28969ec51368b8f0abe104.png)
21-22八年级下·北京房山·期末 查看更多[2]
更新时间:2022-07-17 05:30:03
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