名校
1 . 如图,
中,点E在
边上,
,将线段
绕A点旋转到
的位置,使得
,连接
,
与
交于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/7f79e668-4c82-4add-b222-66d6e9890d65.png?resizew=187)
(1)求证:
;
(2)若
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c2b3d993a79210952ef190542700111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/7f79e668-4c82-4add-b222-66d6e9890d65.png?resizew=187)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7dab0c0c0f988903f228a6510208420.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66c7f20364f887a8482ee4b49d707e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d543ed53e8e7a7e0c7391f8bf20e83da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/600f68bbb24b2f34b6f5ebca90939535.png)
您最近一年使用:0次
2023-12-27更新
|
125次组卷
|
9卷引用:广东省汕尾市某校2022-2023学年九年级上学期期中考试数学试题
广东省汕尾市某校2022-2023学年九年级上学期期中考试数学试题山东省德州市禹城市2022-2023学年九年级上学期期中数学试题 福建省福州市晋安区九校联考2020-2021学年九年级上学期期中数学试卷 福建省龙岩市第五中学2023-2024学年九年级上学期期中数学试题福建省福州市闽侯第二中学教育集团2023-2024学年九年级上学期月考数学试题(已下线)九年级数学开学摸底考(人教版九年级上下册,福建专用)-2023-2024学年初中下学期开学摸底考试卷吉林省松原市第三中学2023-2024学年九年级上学期期中数学试题辽宁省沈阳市和平区第一二六中学2022-2023学年七年级下学期5月月考数学试题辽宁省沈阳市第一二六中学教育集团2022-2023学年 七年级下学期5月份数学学科作业评价试题
2 . 把两个等腰直角
和
按如图1所示的位置摆放,
,将
绕点
按逆时针方向旋转,如图2,连接
,
,设旋转角为
.
.
(2)如图3,若点
在线段
上,且
,
,求
的长.
(3)当旋转角
时,
的面积最大.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/813472fe85905302843cb3aadec9c8ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96e0e554b89644d787a2eeec4b130c5a.png)
(2)如图3,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df049f15adb6667113ceee3a6638cd0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eab2ccc075e9eb14adcaad5feaf69896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(3)当旋转角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251dff989f7d60db751b73033dee269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
您最近一年使用:0次
2023-12-27更新
|
101次组卷
|
11卷引用:2022年河北省廊坊市固安县初中毕业升学模拟考试数学试卷(模拟二)
2022年河北省廊坊市固安县初中毕业升学模拟考试数学试卷(模拟二)(已下线)专题17 手拉手-旋转相似模型-【微专题】2022-2023学年九年级数学上册常考点微专题提分精练(浙教版)(已下线)(挑战压轴)专项6.5 相似三角形(手拉手旋转型综合应用 2大类型)-2022-2023学年九年级数学下册《同步考点解读·专题训练》(苏科版)(已下线)(挑战压轴)专项27.5 相似三角形-一手拉手旋转综合应用(2大类型)-2022-2023学年九年级数学下册《同步考点解读·专题训练》(人教版)(已下线)2022年河北中考数学二模几何综合题2023年湖北省十堰市郧西县中考一模数学试题河南省三门峡市陕州区2023-2024学年九年级上学期期中数学试题山东省济南市槐荫区2022-2023学年八年级下学期期中考试数学试题山东省济南市槐荫区2023-2024学年八年级下学期4月月考数学试题山东省枣庄市滕州市龙泉街道滕东中学2023-2024学年八年级下学期期中数学试题陕西省西安市雁塔区第二中学2023-2024学年八年级下学期月考数学试题
名校
3 . 如图,四边形
为菱形,对角线
、
交于点
,
是
的中点,连接
并延长交
于点
,下列结论:①若
的面积为2,则菱形
的面积为48;②
;③
;④
,其中正确的有___________ .(填所有正确结论的序号)
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4169fe3fa81ac3eff39a0d01c9fa67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25e5b4ac18aa3fb858c72ee906345a7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37cf8093ab0ea5d79627ec01833d7133.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/4540b900-aa63-4d34-a7d1-de3f68a7b72b.png?resizew=206)
您最近一年使用:0次
4 . 如图1,正方形
的边长为4,点P在边
上(P不与 A、D重合),连接
、
.将线段
绕点P顺时针旋转
得到
,将线段
绕点P逆时针旋转
得到
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/24/ba96464a-12bb-4e61-a678-cac7d73dd0e2.png?resizew=407)
(1)求证:
①
的面积
;
②
;
(2)如图2,
的延长线交于点M,取
的中点N,连接
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c73c963e9746ea8aced6a9225395cc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/24/ba96464a-12bb-4e61-a678-cac7d73dd0e2.png?resizew=407)
(1)求证:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95558cdc4ce1e6d9462d2e91c070655f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478f0e9a9dca85dd93ed6f7e5efc5bcb.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13f7e36e001db2084b27ea46ddd7f5ee.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54de600ea0d4d721ade58e5ca2c6a971.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
名校
5 . 如图,矩形
的对角线相交于点O,点E、F分别在
上,
,连接
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f73cc0ee6d9627f264da0273ac315e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff56ea00ca90825f3d95809de24f639.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5541d498cf8a609c87ec3a82006addcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/24/43a3824e-d5e1-4f9a-a256-0b3236669903.png?resizew=163)
您最近一年使用:0次
6 . 如图,矩形
中,
,点E在
上,且
,点F在
边上运动,以线段
为斜边在点B的异侧作等腰直角三角形
,连接
,当
最小时,
的值为__ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22aad646ae9e80c10299af5db1aeba65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0ddf9cf1eeacb8e82b24a44621ea0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7073eba935072a42d907710f7cf2272.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/b011997d-89db-4964-b6bf-0ecd26b9c44e.png?resizew=203)
您最近一年使用:0次
2023-12-24更新
|
134次组卷
|
3卷引用:浙江省温州市乐清市柳市镇第六中学2022-2023学年九年级上学期期中数学试题
浙江省温州市乐清市柳市镇第六中学2022-2023学年九年级上学期期中数学试题(已下线)九年级数学上学期期中仿真检测卷02(浙教版,九上全册)-2023-2024学年九年级数学上学期期中期末考点归纳满分攻略讲练(浙教版)安徽省安庆市桐城市第二中学2023-2024学年九年级上学期期末数学试题
7 . 如图,在
中,
,
,
,点M是线段
上的动点,在线段
上截取
,连接
和
,当点M在运动的过程中,
的最小值为________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f2ae58dfaeda30e3f24c69ba0be25c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/710d5a0053daddc9b73b71aa8d81ebc2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/01d93ffe-f226-429a-b984-11234600490e.png?resizew=172)
您最近一年使用:0次
2023-12-22更新
|
286次组卷
|
2卷引用:广东省深圳实验学校2022-2023学年九年级上学期期末数学试题
8 . 综合与实践
问题情境
在综合实践课上,老师组织兴趣小组开展数学活动,探究正方形的旋转问题.在正方形
和正方形
中,点
在一条直线上,连接
(如图1)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/3c005886-5e48-487a-b2fd-39d24a46990d.png?resizew=580)
操作发现
(1)图1中线段
和
的数量关系是 ,位置关系是 .
(2)在图1的基础上,将正方形
绕着点A沿顺时针方向旋转,如图2所示,(1)中的结论是否成立?请仅就图2的情况说明理由.
类比探究
(3)如图3,若将图2中的正方形
和正方形
都变为矩形,且
,
=![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
,请仅就图3的情况探究
与
之间的数量关系.
拓展探索
(4)在(3)的条件下,若
矩形
在顺时针旋转过程中,当点D,E,F在同一直线时,请直接写出
的值
问题情境
在综合实践课上,老师组织兴趣小组开展数学活动,探究正方形的旋转问题.在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b0e1929185ed79d85e5ee62ba040a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff672e6e4bb29757f6e3051426c3b32.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/3c005886-5e48-487a-b2fd-39d24a46990d.png?resizew=580)
操作发现
(1)图1中线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)在图1的基础上,将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
类比探究
(3)如图3,若将图2中的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eca7507cf2e0109181e0feaf89d4bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e6195da1101f8057244bc9c5567b7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
拓展探索
(4)在(3)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7d8bdd1925ca7c07eeae37379cc0004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
您最近一年使用:0次
9 . 如图,在
中,
,将
绕点
顺时针旋转
得到
,点
关于直线
的对称点为
,连接
交直线
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/6ef79eee-0042-4def-817e-2c34f3bf59b9.jpg?resizew=63)
(1)根据题意补全图形;
(2)判断
的形状并证明;
(3)连接
,用等式表示线段
,
,
之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/6ef79eee-0042-4def-817e-2c34f3bf59b9.jpg?resizew=63)
(1)根据题意补全图形;
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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10 . 综合与实践
探究方法:如图1,在正方形
中,已知
,
,点E、F分别在
、
上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/9ad1f162-928d-4ee8-9066-9ce9e8f7e20d.png?resizew=437)
(1)如图1,把
绕点
逆时针旋转
至
,直接写出线段
、
和
之间的数量关系;
(2)方法迁移:如图2,在四边形
中,已知
,
,点E、F分别在
、
上,
,若
、
都不是直角,但满足
,(1)的结论是否仍然成立,若成立,请写出证明过程,若不成立,请说明理由;
(3)问题应用与拓展:如图1,若
,则
________;
(4)如图3,在
中,
,
,点D、E均在边
上,且
,若
,则
的长为_________.
探究方法:如图1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/9ad1f162-928d-4ee8-9066-9ce9e8f7e20d.png?resizew=437)
(1)如图1,把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.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/3bbd6f0a0412d0f43ce1f7c1d530e56e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)方法迁移:如图2,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173904239da66b7bef7cb1d997cc40ed.png)
(3)问题应用与拓展:如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7887f849a2d7546b0a608b1ff40bc8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
(4)如图3,在
![](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/2c81f43ffb636cda0a5b17f005481cc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c76805974fefbe166b90d260e822ab5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f01c4faacedfe56f5127d6c0cc63cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次