在数学活动课上,老师让同学们以“三角形纸片的折叠、旋转”为主题开展数学活动,探究与角的度数、线段长度有关的问题.对直角三角形纸片
进行如下操作:
,使点C与点A重合,得到折痕
,然后展开铺平,则
与
位置关系为_______,
与
的数量关系为_______;
【再次探究】如图2,将
绕点C顺时针旋转得到
,连接
,若
,求
的值;
【拓展提升】在(2)的条件下,在顺时针旋转一周的过程中,当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03883561f3fefe98a453b12f158282a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
【再次探究】如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c65a9ceae1e189640ff80a9129245fb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/123b4d128fcbf3b721b45e3a36fcfe38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/197873eda3d462ae8e32d69a2c38346a.png)
【拓展提升】在(2)的条件下,在顺时针旋转一周的过程中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663479b655936375757ecb5b6192b0da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
2023·广西·三模 查看更多[5]
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更新时间:2023-05-29 22:41:11
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【推荐1】如图,已知点A是一次函数
的图象与反比例函数的图象在第一象限内的交点,点B在x轴的负半轴上且
,
的面积为
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【推荐2】已知△ABC中,AB=20,AC=15,BC边上的高为12,求△ABC的面积.
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【推荐1】我们知道:有一个角是直角的三角形叫做直角三角形.类似地,我们定义:至少有一组对角是直角的四边形叫做对角直角四边形.
的平行四边形;②矩形;③菱形;
④直角梯形,其中对角直角四边形是 (只填序号);
(2)如图,菱形
的对角线
,
相交于点
,在菱形
的外部以
为斜边作等腰直角
,连接
.
①求证:四边形
是对角直角四边形;
②若点
到
的距离是2,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
④直角梯形,其中对角直角四边形是 (只填序号);
(2)如图,菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2fac8910249a25376a455fb48f55bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
①求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e649a9ac971bc37db8780ab0c1a0d26.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e649a9ac971bc37db8780ab0c1a0d26.png)
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【推荐2】已知:AB是⊙O的弦,OD⊥AB于点M交⊙O于点D,CB⊥AB于点B交AD的延长线于C.
(1)求证:AD=DC;
(2)过D作⊙O的切线交BC于E,若DE=2,CE=1,请你直接写出:AC=___,⊙O的半径=____.
(1)求证:AD=DC;
(2)过D作⊙O的切线交BC于E,若DE=2,CE=1,请你直接写出:AC=___,⊙O的半径=____.
![](https://img.xkw.com/dksih/QBM/2022/1/1/2884970575839232/2887108771233792/STEM/12db689c-1444-440c-9162-943db8be0e02.png?resizew=175)
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【推荐1】如图,在正方形ABCD中,E、F是对角线BD上两点,且∠EAF=45°,将△ADF绕点A顺时针旋转90°后,得到△ABQ,连接EQ,求证:
(1)EA是∠QED的平分线;
(2)EF2=BE2+DF2.
(1)EA是∠QED的平分线;
(2)EF2=BE2+DF2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/14/a09aafc3-e38c-46f2-ad87-fab3c44eeb5b.png?resizew=178)
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【推荐2】如图,矩形
中,
,
,将矩形
绕点
顺时针旋转
,点
分别落在点
,
,
处.
![](https://img.xkw.com/dksih/QBM/2020/5/22/2468201889816576/2469508662468608/STEM/645e0e59f3d5403899c8d2ba306a3b9b.png?resizew=143)
(1)直接填空:当
时,点
所经过的路径的长为___________;
(2)若点
,
,
在同一直线上,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
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(1)直接填空:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91c95365507163f29f01620aacc3974.png)
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【推荐1】如图,一块直角三角板的直角顶点P放在正方形ABCD的BC边上,并且使一条直角边经过点D,另一条直角边与AB交于点Q.
![](https://img.xkw.com/dksih/QBM/2012/7/22/1573463198507008/1573463219675136/STEM/044b1178416d4d1892c5d5e42d15a614.png)
(1)请你写出一对相似三角形,并加以证明;
(2)当点P满足什么条件时,
,请证明你的结论;
![](https://img.xkw.com/dksih/QBM/2012/7/22/1573463198507008/1573463219675136/STEM/044b1178416d4d1892c5d5e42d15a614.png)
(1)请你写出一对相似三角形,并加以证明;
(2)当点P满足什么条件时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbacd8838453981df3076629a47e0df4.png)
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【推荐2】如图,在矩形
中,点
为
的中点,连接
,过点
作
,垂足为
.
(1)求证:
;
(2)若
,
,求
的长;
(3)连接
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/68137511-25cd-4aea-acc9-521153158bb2.png?resizew=148)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e4ef66489d2624ead6e1237c138f7e2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6afed72da8826e84d7a3e86cfe6a999b.png)
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(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95adbf026e5ad4ce6f123e5e0b89da7d.png)
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