如图,用直尺和圆规作
的平分线的示意图如图所示,则下列选项中,能说明图中所作出的射线
是
的平分线的依据是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/9d3e2161-c6dd-473b-9a07-ab69b7b9aec1.png?resizew=157)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/9d3e2161-c6dd-473b-9a07-ab69b7b9aec1.png?resizew=157)
A.![]() | B.![]() |
C.![]() | D.角平分线上的点到这个角两边的距离相等 |
更新时间:2023-12-19 20:21:51
|
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【推荐1】如图,在一个平分角的仪器中,
,
.利用它画图时,先将点A放在角的顶点,
和
沿着角的两边放下,沿
画一条射线
,即
为所求.操作中
依据的数学道理是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/bdf9fc89-3a8d-4979-a15a-2435e29a7158.png?resizew=136)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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A.两边及其夹角分别相等的两个三角形全等 |
B.两角及其夹边分别相等的两个三角形全等 |
C.三边分别相等的两个三角形全等 |
D.两角分别相等且其中一组等角的对边相等的两个三角形全等 |
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【推荐2】工人师傅常用角尺平分一个任意角.作法如下:如图所示,
是一个任意角,在边
,
上分别取
,移动角尺,使角尺两边相同的刻度分别与M,N重合,过角尺顶点C的射线
即是
的平分线.这种作法的道理是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/18/287fcc1e-3e14-4c35-b9d0-617f208bcda1.png?resizew=171)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2032fccdf9ab12429aae024d67b19d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/18/287fcc1e-3e14-4c35-b9d0-617f208bcda1.png?resizew=171)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,在Rt△ABC中,∠A=90°,∠ABC的平分线BD交AC于点D,若AD=2,BC=6,则△DBC的面积是( )
![](https://img.xkw.com/dksih/QBM/2021/12/10/2869370410827776/2878644570931200/STEM/716aad98fc524590b974c1c7244f806f.png?resizew=166)
![](https://img.xkw.com/dksih/QBM/2021/12/10/2869370410827776/2878644570931200/STEM/716aad98fc524590b974c1c7244f806f.png?resizew=166)
A.12 | B.8 |
C.6 | D.2 |
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【推荐2】到三角形三条边的距离相等的点是三角形的( )交点
A.三个内角平分线 | B.三边垂直平分线 | C.三条中线 | D.三条高线 |
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