正方形ABCD和正方形AEFG的边长分别为2和
,点B在边AG上,点D在线段EA的延长线上,连接BE.
(1)如图1,求证:DG⊥BE;
(2)如图2,将正方形ABCD绕点A按逆时针方向旋转,当点B恰好落在线段DG上时,求线段BE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
(1)如图1,求证:DG⊥BE;
(2)如图2,将正方形ABCD绕点A按逆时针方向旋转,当点B恰好落在线段DG上时,求线段BE的长.
![](https://img.xkw.com/dksih/QBM/2019/1/11/2116385832919040/2118621595705344/STEM/aff4d607d1464aef871a04cc726c51e2.png?resizew=313)
更新时间:2019-01-14 16:49:34
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】如图1,在等边
中,
,动点
从点
出发以
的速度沿
匀速运动,动点
同时从点
出发以同样的速度沿
的延长线方向匀速运动,当点
到达点
时,点
、
同时停止运动.设运动时间为
,过点
作
于
,
交
边于
,线段
的中点为
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/0325464f-64c8-42c7-9e4d-e8a14b10121d.png?resizew=511)
(1)当
时,求
的值;
(2)在点
、
运动过程中,点
、
也随之运动,线段
的长度是否会发生变化?若发生变化,请说明理由,若不发生变化,求
的长;
(3)连接
,设四边形
的面积为
,求
与
之间的函数关系式;
(4)如图2,将
沿直线
翻折,得
,连接
,当
为何值时,
的值最小?并求出最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6747441b260ca043446b5d472fece440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4bf2ed4e49655ce765ba6ffbb6c7d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fb80b591b497d8d7a6d8592160de44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc56fdf70e65bd88980c64af96b83da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/0325464f-64c8-42c7-9e4d-e8a14b10121d.png?resizew=511)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eb16aa22587be058e908f9977f8a285.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85f7a62fe27f5fe1ce0540f9a130d77f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(4)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72b886208c6c2df19b984f2631e1c996.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b4f5641787a5ec47d6a8e3fa00f2157.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图,△AOB的三个顶点A、O、B分别落在抛物线C1:y=
x2+
x上,点A的坐标为(﹣4,m),点B的坐标为(n,﹣2).(点A在点B的左侧)
(1)则m= ,n= .
(2)将△AOB绕点O逆时针旋转90°得到△A′OB′,抛物线C2:y=ax2+bx+4经过A′、B′两点,延长OB′交抛物线C2于点C,连接A′C.设△OA′C的外接圆为⊙M.
①求圆心M的坐标;
②试直接写出△OA′C的外接圆⊙M与抛物线C2的交点坐标(A′、C除外).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75096deb06fa2aeaace0ec13f59c9ef1.png)
(1)则m= ,n= .
(2)将△AOB绕点O逆时针旋转90°得到△A′OB′,抛物线C2:y=ax2+bx+4经过A′、B′两点,延长OB′交抛物线C2于点C,连接A′C.设△OA′C的外接圆为⊙M.
①求圆心M的坐标;
②试直接写出△OA′C的外接圆⊙M与抛物线C2的交点坐标(A′、C除外).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/23/0383bc8b-202f-4439-aa0a-04213989396f.png?resizew=265)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】综合与实践
问题背景
数学小组在一次课外学习交流时,组内一同学提出如下问题:在△ABC中,∠ACB=90°,D为BC边上一点,但不与点B,点C重合,过点D作DE⊥AB于点E.连接AD,M为AD的中点,连接EM,CM.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/8134046b-4e08-426b-a937-69e584550e22.png?resizew=251)
观察发现
(1)如图1,EM与CM之间的数量关系是 ;
思考分享
(2)如图2,将△BDE绕点B顺时针旋转,其他条件不变,则(1)中的结论还成立,请证明.
小明是这样思考的:延长DE至点D',使得ED′=DE,连接AD′运用三角形中位线定理,…,按照他的思路或采用其他方法证明;
探究计算
(3)若∠ABC=30°,AC=4,DE=2,在△BDE绕点B旋转一周的过程中,当直线DE经过点A时,线段AD的长为 .
问题背景
数学小组在一次课外学习交流时,组内一同学提出如下问题:在△ABC中,∠ACB=90°,D为BC边上一点,但不与点B,点C重合,过点D作DE⊥AB于点E.连接AD,M为AD的中点,连接EM,CM.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/8134046b-4e08-426b-a937-69e584550e22.png?resizew=251)
观察发现
(1)如图1,EM与CM之间的数量关系是 ;
思考分享
(2)如图2,将△BDE绕点B顺时针旋转,其他条件不变,则(1)中的结论还成立,请证明.
小明是这样思考的:延长DE至点D',使得ED′=DE,连接AD′运用三角形中位线定理,…,按照他的思路或采用其他方法证明;
探究计算
(3)若∠ABC=30°,AC=4,DE=2,在△BDE绕点B旋转一周的过程中,当直线DE经过点A时,线段AD的长为 .
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图,在
中,
,
,
于点D.点G是射线AD上一点,过G作
分别交AB、AC于点E、F:
(1)如图①所示,若点E,F分别在线段AB,AC上,当点G与点D重合时,求证:
;
(2)如图②所示,当点G在线段AD外,且点E与点B重合时,猜想AE,AF与AG之间存在的数量关系并说明理由;
(3)当点G在线段AD上时,请直接写出
的最小值.
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2e679d7b314ff58c284da08e8edbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9c257b9502b7eda5fd2ff8b6fbc6c7d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/b8a665c4-3204-4863-8152-e775931f1f28.png?resizew=578)
(1)如图①所示,若点E,F分别在线段AB,AC上,当点G与点D重合时,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ef73f7abcfec2a095949321c34ef0b.png)
(2)如图②所示,当点G在线段AD外,且点E与点B重合时,猜想AE,AF与AG之间存在的数量关系并说明理由;
(3)当点G在线段AD上时,请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9c68466c946bb624071672f5e91891.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60921aa50c55ae8a3362ef55306fd6ff.png)
您最近一年使用:0次