如图(1),已知点G在正方形
的对角线
上,
,垂足为点E,
,垂足为点F.易证四边形
是正方形.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/22/df33fb5d-9893-4b16-a831-5b7d2d00ff4f.png?resizew=395)
(1)推断,
的值为 ;
(2)探究与证明:将正方形
绕点C顺时针方向旋转α角
,如图(2)所示,试探究线段
与
之间的数量关系,并说明理由:
(3)拓展与运用:正方形
在旋转过程中,当B,E,F三点在一条直线上时,如图(3)所示,延长
交
于点H.若
,
.则
![](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/d0ddc47cce2e80eefc150192061c3b70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7fe55d17f5ca49389dd2cb1ab74ac2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920ae90193d50ae60beafae6f2b4ebcd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/22/df33fb5d-9893-4b16-a831-5b7d2d00ff4f.png?resizew=395)
(1)推断,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ec2c1bca9d89d16df525a45408aa76.png)
(2)探究与证明:将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920ae90193d50ae60beafae6f2b4ebcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d235f9fc4293435ed0e81660ea86f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(3)拓展与运用:正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920ae90193d50ae60beafae6f2b4ebcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7978151ee28b5d0b797786526d303d21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea88e1806b38ad1e335bdfc4612809c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
更新时间:2024-03-22 07:28:32
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解答题-证明题
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【推荐1】如图1,四边形ABCD是正方形,点E在正方形外角的平分线上,连接AE,记AE与对角线BD的交点为M.
;
(2)如图2,点N是边AB的中点,连接MN,若
,请探索BE与BD的数量关系,并说明理由;
(3)在(2)的条件下,记BE与边CD的交点为点F,在BC边上取点P,使
,连接AP,AF,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68382641b5e0cbaf624f70126d90ca06.png)
(2)如图2,点N是边AB的中点,连接MN,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e881033f2cadb515ad3ecb18727f1abb.png)
(3)在(2)的条件下,记BE与边CD的交点为点F,在BC边上取点P,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31824bc9454b2e8654dbb9cfa060e363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf34d7984aa53ae3efb6088aeaacc718.png)
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【推荐2】如图,点E为正方形
内一点,连接
,
是等腰直角三角形,
,
,
绕点A旋转.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/0435d2a2-de7d-4656-9968-34e12edf711d.png?resizew=126)
(1)求证:
;
(2)在
绕点A旋转的过程中,延长BE交线段DF于点G,连接CG.
①
是否为定值?如果是,请证明;如果不是,请说明理由;
②若
,
,求线段CG的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/0435d2a2-de7d-4656-9968-34e12edf711d.png?resizew=126)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec412ebd940d71b983ce4877e3401ee.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
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【推荐1】如图1,已知锐角△ABC的高AD、BE相交于点F,延长AD至G,使DG=FD,连接BG,CG.
![](https://img.xkw.com/dksih/QBM/2022/1/12/2892608644997120/2893534234353664/STEM/155a659c-1bc9-4958-853a-378cad141523.png?resizew=332)
(1)求证:
;
(2)如果
,设
.
①如图2,当∠ABG=90°时,用含m的代数式表示△BFG的面积;
②当AB=8,且四边形BGCE是梯形时,求m的值.
![](https://img.xkw.com/dksih/QBM/2022/1/12/2892608644997120/2893534234353664/STEM/155a659c-1bc9-4958-853a-378cad141523.png?resizew=332)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c16543c00b2dc8b065d472e51b645d7.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5742cf003ad2dacfdd66fab57de7bee.png)
①如图2,当∠ABG=90°时,用含m的代数式表示△BFG的面积;
②当AB=8,且四边形BGCE是梯形时,求m的值.
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解答题-证明题
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【推荐2】已知
内接于
,
是直径,过点
作
的切线
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/a4368f79-7204-4b80-aa70-4e35e31f3cb6.png?resizew=568)
(1)如图1,求证:
;
(2)如图2,当
是弧
的中点时,过点
作
于
.求证:
;
(3)如图3,在(2)的条件下,
与
相交于点
,连接
、
与
相交于点
,若
的面积为12,
,求点
到
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/a4368f79-7204-4b80-aa70-4e35e31f3cb6.png?resizew=568)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29968d8d96d91abf6a99350010065343.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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(3)如图3,在(2)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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