已知:如图,将
绕点A顺时针旋转得到
,点E对应点C恰在
的延长线上,若
.求证:
为等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e69b521526723ace41175d6754ae66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/cb05efe5-75ca-4b42-b6a6-6d2dd0621587.png?resizew=148)
更新时间:2022-11-02 22:42:19
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相似题推荐
解答题-问答题
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【推荐1】如图,已知
,
,点
是射线
上一动点(与点
不重合),
,
分别平分
和
,交射线
于点
,
.
的度数;
(2)在点
运动过程中,试判断
与
之间的数量关系?并说明理由;
(3)当点
运动到使
时,求出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d7dc7451e667ad77a26e75ce11e709e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0ae79a16f786bf2077ee37c564435f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/552349f3dfaaf9b4184831e4be55e4c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fa6fc58decfb1d02b2a8237e44992b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f9c51f3ef9abcf0cdcb8aa8d4ddfe9e.png)
(2)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e20592db1026476ba6b2ab0ee9c3b08b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/066c7fd724932eef6a43ec951f17981c.png)
(3)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61a4ae4ddeb129c03c7c86b2379ea654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f4da037fe7fa1dff1116c17df53a99f.png)
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【推荐2】一块含
角的直角三角尺
(
,
)放在两条平行线
,
之间.
(1)如图1,若三角形的
角的顶点G放在
上,且
,求
的度数;
(2)如图2,若把三角尺的两个锐角的顶点E,G分别放在
和
上,请你探索并说明
与
间的数量关系;
(3)如图3,若把三角尺的直角顶点F放在
上,
角的顶点E落在
上,请直接写出
与
的数量关系.
(4)问题解决:一大门的栏杆如图4所示,
垂直于地
于A,
平行于地面
,则
______度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b9f4fe60b81ff21ca2acc95848a643d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0af1b329e6a00b783376db898246729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/21/afc78669-a453-4636-a764-491197a183db.png?resizew=398)
(1)如图1,若三角形的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/328e8bac51453f4a8f98a2461e5ac502.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
(2)如图2,若把三角尺的两个锐角的顶点E,G分别放在
![](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/1b6a23d521606a35298bbf147f7f830c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/600f68bbb24b2f34b6f5ebca90939535.png)
(3)如图3,若把三角尺的直角顶点F放在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482e68d608de7675e15bb759acd8204c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f03556dce00ae2459f8f8f0e7ffff95.png)
(4)问题解决:一大门的栏杆如图4所示,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd6f991557bac64eb2781dca73bb5736.png)
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【推荐1】如图①,在一张长方形纸片
上画一条线段
,将纸片沿线段
折叠(如图②),当
时,试问重叠部分的
是什么三角形,请说明理由(注:长方形纸片对边平行,即:
)\
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee4e0de0c1de0835766b7f627f348c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e4f9a9fd59ac8fde1cd5e456003e10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d474b8cf554bed0cafd7db7f7c0a9e42.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/21/0a484b26-1df9-4074-b64d-9c72daa1ad0a.png?resizew=350)
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解答题-证明题
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【推荐2】如图,在
和
中,
,点E为
中点,
,
,点E、F关于
成轴对称,连接
.求证:
为等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78e297915d9058d34dff8b45a181086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/962c55ad3209350c941e1cee03f631a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c7b7be09862e90dd0065ec7b712e024.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/0fa20b71-0ed0-40b2-9044-2120f2ac8985.png?resizew=138)
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【推荐1】如图,将△ABC绕点B顺时针旋转60°后得到△DBE(点A对应点D),线段AC交线段DE于点F,求∠EFC的度数
![](https://img.xkw.com/dksih/QBM/2018/2/19/1885690803273728/1895492468252672/STEM/96bdc9ac84974014aa8b84b1fa8c127d.png?resizew=178)
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解答题-证明题
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【推荐2】将两个全等的
和
按图1方式摆放,其中
,点E落在AB上,DE所在直线交直线AC于点F.
![](https://img.xkw.com/dksih/QBM/2020/11/5/2586372556734464/2588342901604352/STEM/9b0cea9f-ce31-4c24-8c42-84ad3a639a9d.png)
(1)求证:
;
(2)若将图1中
绕点B按顺时针方向旋转到图2位置,其他条件不变(如图2),请写出此时AF、EF与DE之间的关系,并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b0292ea58aea664b032135212b8e60b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74db1f028c135803c5f56852ec330d01.png)
![](https://img.xkw.com/dksih/QBM/2020/11/5/2586372556734464/2588342901604352/STEM/9b0cea9f-ce31-4c24-8c42-84ad3a639a9d.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab618c936da03808cb9953783d42b30.png)
(2)若将图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
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