综合与实践-问题情境:
如图1,已知在
中,
分别是
上的点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/31/8ef54dfc-f1c3-4bd4-b7a2-890ea30e486d.jpg?resizew=335)
(1)操作发现:求证:
.
(2)深入探究:在图1的基础上,将
绕着点
逆时针旋转一个角度得到图2,连接
,那么(1)中的结论是否仍然成立?请判断并说明理由.
拓展探究:
(3)如图3,当
旋转到点
在一条直线上时,
与
交于点
,若
,
,求
的值.
如图1,已知在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e261a942097fc850672dc68fab43229.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17487118ab7a90fc8c91bf0870f3289e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d021981c03e75b1a246d899dcc64656.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/31/8ef54dfc-f1c3-4bd4-b7a2-890ea30e486d.jpg?resizew=335)
(1)操作发现:求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/125b370a235db9f72c3d4f3eb6af8916.png)
(2)深入探究:在图1的基础上,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97003164f5f1cde871b63624b96e81.png)
拓展探究:
(3)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284dfad7ced5716f25a4a5046e7ab81c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e5e8fe2cf6bd5d0ba5dfeb0697a90a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36844ba7cd37d4717881f5c077913ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041df224a926bb459f15ee4c29626697.png)
更新时间:2023-12-31 11:33:13
|
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【推荐1】如图,
绕点A逆时针旋转
,得到
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的延长线于点D,交
于E,连接
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,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/ee311a42-aed6-4745-87a8-df69dc2a5fa6.png?resizew=159)
(1)试说明
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
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(1)试说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd437f4917539fbc598e539ffe422c7.png)
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【推荐2】如图,
,
绕点A逆时针旋转得到
,恰好点
在
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.
![](https://img.xkw.com/dksih/QBM/2022/11/11/3107140698824704/3125636027318272/STEM/8b3ca555779442a38185c31bb4fad771.png?resizew=178)
(1)
与
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(2)
与
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(3)线段
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
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![](https://img.xkw.com/dksih/QBM/2022/11/11/3107140698824704/3125636027318272/STEM/8b3ca555779442a38185c31bb4fad771.png?resizew=178)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
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(3)线段
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名校
【推荐1】小明想用刚学过的知识测量一棵大树的高度,他和学习小组的同学带着测量工具来到这棵大树前,将镜子放在离大树32m的C处(即
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【推荐2】如图,正方形ABCD中,E为BC上一点,EF⊥AE,交CD于点F,求证:AB:CE=BE:CF.
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