如图,在正方形
和
中,点
,
,
在同一条直线上,
是线段
的中点,连接
,连接
并延长,交
于点
.请证明:
是矩形.
(2)当
时,四边形
是正方形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cd39521d8f419ba7204849b8783808a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a8586ae37f043ee8d5162dec22126b.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d9060d7c8359fefd0cfd0d2d75197c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a8586ae37f043ee8d5162dec22126b.png)
更新时间:2023-05-05 12:17:06
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】背景:一次小组合作探究课上,小明将两个正方形按如图1所示的位置摆放(点E、A、D在同一条直线上),小组讨论后,提出了下列三个问题,请你帮助解答:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/5/318e55d4-f455-48db-9d82-f3ea81bfb7a0.png?resizew=465)
(1)如图2,将正方形
绕点A按逆时针方向旋转,求
与
的数量关系和位置关系;
(2)如图3,把背景中的正方形分别改写成矩形
和矩形
,且
,
,
,将矩形
绕点A按顺时针方向旋转,求
与
的数量关系和位置关系;
(3)在(2)的条件下,小组发现:在旋转过程中,
的值是定值,请求出这个定值.(直接写出答案)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/5/318e55d4-f455-48db-9d82-f3ea81bfb7a0.png?resizew=465)
(1)如图2,将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
(2)如图3,把背景中的正方形分别改写成矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9213da82fd4080bb3097671bdd2a28e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070bc896d35495237fd65576e9b6f88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
(3)在(2)的条件下,小组发现:在旋转过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfd35e8ebeb27cf3a4128c0c59904e63.png)
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【推荐2】如图,M是等边三角形
内的一点,连接
,
,
,以
为边作
,且
,连接
.
(1)猜想
与
之间的数量关系,并说明理由;
(2)若
,连接
,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2449b6be64417beea30528886720c20f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed2e0ff5526d047c4772a9e24855f9ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/19/aff09af2-b12f-4aae-bf0b-ed6e1f0262c1.png?resizew=149)
(1)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a99c53214616a72e10265ff39acfddd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8139744f19c1918d3a44d52e07a806a6.png)
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【推荐1】如图,在平面直角坐标系中,直线
与
轴、
轴分别交于
两点,且
,过点
在第二象限内作
,且
.
(1)求
的值;
(2)若在第一象限内有一点
,且
的面积与
的面积相等,求
的值;
(3)将
向右平移得到
,点
的对应点
始终在
轴上,当点
的对应点
落在直线
上,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acd55f837e9c4e6bba1163ef13edd09b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/913f78382630e50543e5f7192cae3ed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822ba132ca9dd0d4a050659aef3c9b26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d384390f4e0a1e0abd4cc19382d94db.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/16/5016eabd-41ff-4965-921c-a5d4d8328ed5.jpg?resizew=187)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)若在第一象限内有一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64398f8ff62f30bf8d36b34222f4da94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ee6e1d480ece7117e1f87ebf4bbeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
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【推荐2】如图,在平面直角坐标系
中,直线
的解析式为
,与
轴、
轴分别交于点
、点
,抛物线
经过点
,与直线
交于点
,点
的横坐标为
,抛物线的对称轴为
.
(2)动点
在直线
上方的抛物线上,点
的横坐标为
,过点
作
轴的平行线交
于点
,过点
作
轴的平行线交
于点
,当
时,求
值;
(3)点
是坐标平面内一点,将
绕点
沿逆时针方向旋转
后,得到
,点
、
、
的对应点分别是点
、
、
.若
的两个顶点恰好落在抛物线上,请直接写出此时点
的横坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e1091fb901674a0b7c73a104e9657d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75929925842ca723b34647ccaa596cdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af86a954dad92dfc94f837955f82718.png)
(2)动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29819c98ebd087116d5e579f4f088fe8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd93c18ae02dfb0345608b1cb475664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd93c18ae02dfb0345608b1cb475664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
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【推荐3】在一个图形的内部(含边界)任取一点构造直角,使直角绕着顶点旋转,与该图形相交能构成一个新的封闭区域,那么我们称这个图形为“底弦图”,其中直角所对的“线”称为“直角弦”.
(1)如图1,“底弦图”是一个半径为3的圆,
的顶点在
上,
所对的
即为它所对的“直角弦”,小乐同学发现,在旋转过程中,
所对的“直角弦”的长度是定值,该定值为_______;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/3/d9da19de-7783-493c-94ed-413222631e49.png?resizew=175)
(2)如图2,“底弦图”是一个边长为3的正方形,∠
的顶点在正方形的中心,折线
即为
所对的“直角弦”,在旋转过程中
所对的“直角弦”的长度是定值吗?请仅就图2的情况说明理由;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/3/a46ac8e8-d85e-425a-a761-2d3fe0326d3c.png?resizew=143)
(3)如图3,“底弦图”是一个长为6,宽为4的矩形.
,在旋转过程中
的两边与矩形分别相交于点
(
在
的左侧).
.若
,在旋转过程中
所对的“直角弦”的长度是定值时,请直接写出线段
的取值范围.
(1)如图1,“底弦图”是一个半径为3的圆,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/3/d9da19de-7783-493c-94ed-413222631e49.png?resizew=175)
(2)如图2,“底弦图”是一个边长为3的正方形,∠
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e1ef332e81b9dbaf0075a345711b02c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/3/a46ac8e8-d85e-425a-a761-2d3fe0326d3c.png?resizew=143)
(3)如图3,“底弦图”是一个长为6,宽为4的矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/982635c07eaa7715b1ffd9dbabc3bcaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a373959bb9026f8a09845c0b828bf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3c7e1bf15c0502585561bbef1fb422.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1220350be0d8606c2f05e96c996ddd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/3/b51379ef-cdb4-4f7c-9327-f163436b2fc8.png?resizew=190)
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【推荐1】如图,四边形ABCD为⊙O的内接四边形,且对角线AC为直径,AD=BC,过点D作DG⊥AC,垂足为E,DG分别与AB,⊙O及CB延长线交于点F、G、M.
(1)求证:四边形ABCD为矩形;
(2)若N为MF中点,求证:NB是⊙O的切线;
(3)若F为GE中点,且DE=6,求⊙O的半径.
(1)求证:四边形ABCD为矩形;
(2)若N为MF中点,求证:NB是⊙O的切线;
(3)若F为GE中点,且DE=6,求⊙O的半径.
![](https://img.xkw.com/dksih/QBM/2019/6/7/2220460998082560/2223167290499072/STEM/c52990ba2838428a805935e229c0342b.png?resizew=186)
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【推荐2】如图,在▱ABCD中,对角线AC,BD相交于点O,点E,F分别为OB,OD的中点,延长AE至点G,使AE=GE,连接CG,CF.
(1)求证:△AOE≌△COF;
(2)只需添加一个条件,即 ,可使四边形CGEF为矩形,请加以证明.
(1)求证:△AOE≌△COF;
(2)只需添加一个条件,即 ,可使四边形CGEF为矩形,请加以证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/c29b47fc-5789-4617-bd97-47c1080e0799.png?resizew=220)
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解答题-作图题
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【推荐1】如图,在平面直角坐标系中,
的三个顶点坐标分别为
,
,
,格点
在
上,请用无刻度的直尺,按要求完成下列画图,并回答相关问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/73dca12a-cece-458f-8c5d-661ca6b056d8.png?resizew=203)
(1)将
绕点
逆时针旋转
得到
,点
随之旋转,画出
,并写出点
的对应点
的坐标______;
(2)画
的角平分线
;
(3)在
上取点
,使
;
(4)找格点
,使
,直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c179fe7eff7abfdd092b63c9c1b82d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ec42e55b8069a1c65d010e9b6080a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5159a1a4db70dcc74f2e380b8a3dd499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/73dca12a-cece-458f-8c5d-661ca6b056d8.png?resizew=203)
(1)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
(2)画
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca2698f08d94afa1cd5b81444791f4c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b15fd5370fedb2cfe465a79365f9a8.png)
(4)找格点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1359a03f308d3f47e58b156805de5c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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解答题-证明题
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【推荐2】已知,四边形
是正方形,
绕点
旋转
,连接
.
(1)如图1,求证:
;
(2)直线
与
相交于点
.如图2,
于点
于点
,求证:四边形
是正方形;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1054b7d828b0665292deff7592217d6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b1efb5d9072a67be9d5497a783016c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/9/0f08ff8c-6749-4284-8a3a-b281fe838c41.png?resizew=389)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c9f501137809dba21dfab7dd56f68f7.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88583f8fb68d7158bedb4510279a0fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0c981a5399c6550370ad71bff3c9cc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e6a3a9baec1572be5c3b15ac2dec9dd.png)
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【推荐3】背景阅读 早在三千多年前,我国周朝数学家商高就提出:将一根直尺折成一个直角,如果勾等于三,股等于四,那么弦就等于五.它被记载于我国古代著名数学著作《周髀算经》中,在本题中,我们把三边的比为
的三角形称为
型三角形,例如:三边长分别为9,12,15的三角形就是
型三角形,用矩形纸片按下面的操作方法可以折出这种类型的三角形.
实践操作 如图①,在矩形纸片
中,
cm,
cm.
第一步:如图②,将图①中的矩形纸片
沿过点A的直线折叠,使点D落在
上的点E处,折痕为
,再沿
折叠,然后把纸片展平.
第二步:如图③,将图②中的矩形纸片再次折叠,使点D与点F重合,折痕为
,然后展平,隐去
.
第三步:如图④,将图③中的矩形纸片沿
折叠,得到
,再沿
折叠,折痕为
与折痕
交于点N,然后展平.
问题解决
(1)请在图②中证明四边形
是正方形;
(2)请在图④中判断
与
的数量关系,并加以证明;
(3)请在图④中证明
是
型三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d44d5798d856568f7f6e5e91269ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e95c5c251ddd1aebc68d33892419305.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e95c5c251ddd1aebc68d33892419305.png)
实践操作 如图①,在矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
第一步:如图②,将图①中的矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
第二步:如图③,将图②中的矩形纸片再次折叠,使点D与点F重合,折痕为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
第三步:如图④,将图③中的矩形纸片沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88c6de1903f0783e762ae6b1fcf1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b123ae31090740589ba27a846620b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/697530f197021c9f85a4272c4e9e6317.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
问题解决
(1)请在图②中证明四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946c16d99496d31ce4d87301a4793393.png)
(2)请在图④中判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360496a4f5cc8a5faca5e089ae4f9531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7443b09d74b9180b1760662b8c10e608.png)
(3)请在图④中证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/654a3aacb8539b4996023caf5b55c85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e95c5c251ddd1aebc68d33892419305.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/7/199fcc40-a6e1-4340-a6cc-2a784c9afd30.png?resizew=376)
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