小红发现,任意一个直角三角形都可以被分割成两个等腰三角形.
已知:在
中,
.
求作:直线
,使得直线
将
分割成两个等腰三角形.
下面是小红设计的尺规作图过程,
作法:①作
的垂直平分线
,交斜边
于点D;②作直线
,则直线
就是所求作的直线.
根据小红设计的尺规作图过程.
(1)使用直尺和圆规,补全图形(保留作图痕迹);
(2)完成下面的证明.
证明:∵直线
是线段
的垂直平分线,点D在直线
上,
∴
.(①__________________)(填推理的依据)
∴
.(②_________)(填推理的依据)
∵
,
∴
.
∴
.
∴
.(③_________)(填推理的依据)
∴
和
都是等腰三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/11/daef0de3-8065-49a6-9354-15a947b54949.jpg?resizew=148)
已知:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
求作:直线
![](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/dd967903ed5a6f640a5b801ec8be0070.png)
下面是小红设计的尺规作图过程,
作法:①作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.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)
根据小红设计的尺规作图过程.
(1)使用直尺和圆规,补全图形(保留作图痕迹);
(2)完成下面的证明.
证明:∵直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93b5d552bf92224ac9332e93741fcfb8.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e5357c1d8b14eb70ee029d2634db9d.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73eb195644ec055ccd3352de2a6443a7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a428e02d1fa1937504356b929fc256d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d103d10df3c1ac5fb0e9bfa07953b7a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41f0dadf037efedc90b39c57a6880a1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b93f77fc658b1f307566bb05d6d629fb.png)
更新时间:2023-11-05 20:42:03
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26b33f5b71039c35ac5e93795e254f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5167b59fbb5a9c95f6726920712be0c.png)
![](https://img.xkw.com/dksih/QBM/2021/6/2/2734499679977472/2734908716310528/STEM/dc338c97-e6e5-411d-b8c3-e16b7607f6f8.png)
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