如图,将
绕点A顺时针旋转
得到
,若线段
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/2023/7/3/3273113840926720/3281496490278912/STEM/57fbe40c65254122b8995ee655b9558b.png?resizew=248)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/2023/7/3/3273113840926720/3281496490278912/STEM/57fbe40c65254122b8995ee655b9558b.png?resizew=248)
A.4 | B.![]() | C.![]() | D.8 |
更新时间:2023-07-18 21:13:49
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【推荐2】下列命题中:①等腰三角形一腰上的高与底边的夹角等于顶角的一半;②等腰三角形两腰上的高相等;③如果三角形一边上的中线等于这条边的一半,那么这个三角形是直角三角形;④有两个角是60°的三角形是等边三角形.正确的说法有( )
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐1】如图,将三角形
绕点C逆时针旋转一定的角度得到三角形
,此时点A在边
上.若
,
,则
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3636b407d8818e15891e18db47fa0c9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/020ebe1219437129358b986eb9e70bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/25/15b7b026-ae3e-4f96-835d-6edb02fd4b35.png?resizew=158)
A.4 | B.3 | C.2.5 | D.2 |
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【推荐2】如图,在四边形ABCD中,
,
,现把四边形经过某种操作,可以得到与它面积相等的等腰直角三角形,这个操作可以是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/b9827920-58dc-4539-8c3e-d21da303a9e1.png?resizew=250)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59281d3136f2c67c078d98842171224d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/b9827920-58dc-4539-8c3e-d21da303a9e1.png?resizew=250)
A.沿![]() ![]() ![]() |
B.沿![]() ![]() ![]() |
C.沿![]() ![]() ![]() |
D.沿![]() ![]() ![]() |
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