名校
1 . 【问题情境】
和
是共顶点的两个三角形,点P是边
上一个动点(不与B重合),且
,
,连接
.
(1)【特例分析】如图①,当
,
时.猜想
与
之间的数量关系,并说明理由;并求出
的度数.
(2)【拓展探究】如图②,当
,
时.请判断
与
的数量关系以及
与
之间的数量关系,并说明理由.
(3)【学以致用】如图③,当
,
,
,
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7fbd6b9f85c086ac95562fe45e8d969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/768e16640897560f85eb38ed7cb6512f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4a64f48ce64bcd490992a4ada1ef9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/3ed65cdc-d578-40bf-a953-478106dcdb26.png?resizew=395)
(1)【特例分析】如图①,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8625b92cffeee72845e2823899fc2cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241e82458d3829175373c3c018f15be0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
(2)【拓展探究】如图②,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8625b92cffeee72845e2823899fc2cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15928c11adfe993baa96ee76cb929f8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)【学以致用】如图③,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0505b2b098dc34a0d3c6be71b3e36f25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cedd51383f8f047f565191b128cec637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/574dc284fb9e74d65cf0c79a978d65de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
2023-05-19更新
|
156次组卷
|
4卷引用:2023年湖北省襄阳市枣阳市中考一模数学试题
2023年湖北省襄阳市枣阳市中考一模数学试题(已下线)2023年襄阳一模(几何综合)(已下线)2023年湖北省黄冈市中考数学真题变式题21-24题山东省日照市东港区新营中学2023-2024学年九年级上学期12月月考数学试题
2 . 【问题提出】如图1,在
中,
,点
,
分别为边
,
的中点,将
绕点
顺时针旋转
,连接
,
,试探究
,
之间存在怎样的数量关系和位置关系?
,将
绕点C顺时针旋转至图2的位置,直线
与
,
分别交于点
,
.按以下思路完成填空(第一个空填推理依据,第二个空填数量关系,第三个空填位置关系):
∵
,点
,
分别为边
,
的中点
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac679f877d3e3b3acef1f1f8e3654b4b.png)
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cd4258494ace78556e465e02513c6c3.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/627e946cdb6ed2652fee6c26db93bac9.png)
∴
(__________)
∴
__________
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4028de7de29c71c4fb2f83b6c951680.png)
又∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d08319f9623e9729df57ca6edee11f5.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccb93d163954e5cf7b92feff5a61057.png)
∴
__________
.
【猜想证明】若
,
绕点
顺时针旋转至图3的位置,直线
与
,
分别交于点
,
,猜想
与
之间的数量关系与位置关系,并就图3所示的情况加以证明;
【拓展运用】若
,
,将
绕点
顺时针旋转
,直线
与
相交于点
,当以点
,
,
,
为顶点的四边形是矩形时,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f5a0a6e5b3f489a7032ea5116c96024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c54ce139ae5d63691cac8a1ce5bbfe4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f5a0a6e5b3f489a7032ea5116c96024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac679f877d3e3b3acef1f1f8e3654b4b.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cd4258494ace78556e465e02513c6c3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/627e946cdb6ed2652fee6c26db93bac9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ee313629fdb421c7b0ee01ed3b6fa5.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4028de7de29c71c4fb2f83b6c951680.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d08319f9623e9729df57ca6edee11f5.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccb93d163954e5cf7b92feff5a61057.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
【猜想证明】若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c6dd4cf25c7ffbcc91c22446b5352c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f5a0a6e5b3f489a7032ea5116c96024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
【拓展运用】若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f5a0a6e5b3f489a7032ea5116c96024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c54ce139ae5d63691cac8a1ce5bbfe4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
您最近一年使用:0次
2023-05-18更新
|
151次组卷
|
3卷引用:2023年湖北省随州市曾都区中考一模数学试题
3 . (1)操作发现:在综合实践课上,同学们进行正方形图形变换探究活动,如图1,四边形
和四边形
都是正方形,点E在
上运动,在
上截取
,使
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/18/81d9942b-f5b9-4361-b4d4-af3e2423bb32.png?resizew=620)
①发现:
,请证明;
②推断:线段
与
的关系是______ ;
(2)探究拓展:如图2,四边形
和四边形
都是矩形,点E在
上运动,
,在
上截取
,使
,连接
.判断线段
与
的关系并证明;
(3)学以致用:在(2)的条件下,连接
交
于点M,连接
并延长交
于点P(如图3).当
时,若
,
,求
的长.
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1289b01f9dde573ca64d716233e36cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/18/81d9942b-f5b9-4361-b4d4-af3e2423bb32.png?resizew=620)
①发现:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6479f73d9fa2b3220de4f8e2c0f1699c.png)
②推断:线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)探究拓展:如图2,四边形
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8d86dbbe5909cf4718e91df0a29706c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f89f6e9e0dd98070858129d8da0690d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)学以致用:在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c678cb3d5175830b4b6b9968dfc5048b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a51acdbf1275b5de9d64c81b843fa1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04725e51b4870658f74de79403e3898f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
您最近一年使用:0次
2023-05-15更新
|
163次组卷
|
3卷引用:2023年湖北省襄阳市老河口市中考一模数学试题
4 . 问题提出:如图(1),在
中,
,D是
内一点,
,若
,连接
,求
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/10d5bfc9-78b0-4ea0-a1ea-e36b515c7ae5.png?resizew=385)
(1)问题探究:请你在图(1)中,用尺规作图 ,在
左侧作
,使
.(用直尺、圆规作图,保留作图痕迹,不写作法,不说明理由)
(2)根据(1)中作图,你可以得到
与
的位置关系是_______;你求得
的长为_______;
(3)问题拓展:如图(2),在
中,
,D是
内一点,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4878c22a50d3707e43c4958c27867fd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34f51243ca057a1cdbfdf92c3e0ea3bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/10d5bfc9-78b0-4ea0-a1ea-e36b515c7ae5.png?resizew=385)
(1)问题探究:请你在图(1)中,用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd6efd524e85bccb89fa4e859095df8e.png)
(2)根据(1)中作图,你可以得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)问题拓展:如图(2),在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4878c22a50d3707e43c4958c27867fd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/687574c06c51a8bbc764777c675ab50a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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2023-04-03更新
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408次组卷
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4卷引用:2023年湖北省武汉市江南六校九年级下学期3月调考数学试卷
5 . 如图,已知
,M为边
上一动点,
,D为边
上一动点,
,
交
于点N.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/2/f283cd8c-b5c8-424c-9b77-f18c6ac93c18.png?resizew=145)
(1)【问题提出】三角形的三条中线会相交于一点,这一点就叫做三角形的重心,重心有很多美妙的性质,请大家探究以下问题
若
,则
______(直接写出结果)
(2)【问题探究】若
,猜想
与n存在怎样的数量关系?并证明你的结论
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/2/cb845f04-fdcf-41f6-a972-78c12d99be0a.png?resizew=144)
(3)【问题拓展】若
,
,则
______(直接写出结果)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98caa861545702b245f784763e2a8fb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8bcdf7b87d420ca5d62a9a7be622c00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/2/f283cd8c-b5c8-424c-9b77-f18c6ac93c18.png?resizew=145)
(1)【问题提出】三角形的三条中线会相交于一点,这一点就叫做三角形的重心,重心有很多美妙的性质,请大家探究以下问题
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/821fa0301d20076ad2e541f8c4a86231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c708e6fb5afa56cce4c02fdc2902a92e.png)
(2)【问题探究】若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43dbaba6a18402f0010e7dca9e90d44a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/2/cb845f04-fdcf-41f6-a972-78c12d99be0a.png?resizew=144)
(3)【问题拓展】若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0086b054ef120408acac806a1b1318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc2d3df37e73a8abea815f37dbb3fff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81489a2f2e16926e2bd2db78da4e39af.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/2/5ef28070-a768-48c0-ae9c-b98c28511c5c.png?resizew=145)
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6 . (1)证明推断
如图1,在正方形ABCD中,点E是对角线BD上一点,过点E作AE,BD的垂线,分别交直线BC于点F,G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/e600d205-ae70-4e79-8672-f8f1d762a2fc.png?resizew=134)
①求证:
;②推断:
的值为______;
(2)类比探究
如图2,在矩形ABCD中,
,点E是对角线BD上一点,过点E作AE,BD的垂线,分别交直线BC于点F,G.探究
的值(用含m的式子表示),并写出探究过程;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/4213caac-f852-4ddf-b881-a744f619b750.png?resizew=172)
(3)拓展运用
在(2)的条件下,连接CE,当
,
时,若
,求EF的长.
如图1,在正方形ABCD中,点E是对角线BD上一点,过点E作AE,BD的垂线,分别交直线BC于点F,G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/e600d205-ae70-4e79-8672-f8f1d762a2fc.png?resizew=134)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51b8ce39fa2053d641bf5a244ef61d63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd01a4cbd347fce1a7414eb9fa73d16.png)
(2)类比探究
如图2,在矩形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1d3328b14c14879619e3ad894f7fe0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd01a4cbd347fce1a7414eb9fa73d16.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/4213caac-f852-4ddf-b881-a744f619b750.png?resizew=172)
(3)拓展运用
在(2)的条件下,连接CE,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8493a0cd10d3d0399173c04163740a38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1d267eeb09c171c3e847f0597be31c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b21093eae7765f54a8de66750a63e1a6.png)
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2022-04-07更新
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5卷引用:2022年湖北省襄阳市初中毕业生“新中考”文化课模拟(一模)数学试题
2022年湖北省襄阳市初中毕业生“新中考”文化课模拟(一模)数学试题(已下线)2023年湖北省中考数学真题变式题21-24题(已下线)押四川卷26题 三角形、四边形综合探究-备战2022年中考数学临考题号押题(四川专用)2022年广东省广州市从化区九年级中考数学二模试卷2022年广东省广州市南沙区九年级数学二模试卷
真题
名校
7 . 问题提出:如图(1),
中,
,
是
的中点,延长
至点
,使
,延长
交
于点
,探究
的值.
时,直接写出
的值;
(2)再探究一般情形.如图(1),证明(1)中的结论仍然成立.
问题拓展:如图(3),在
中,
,
是
的中点,
是边
上一点,
,延长
至点
,使
,延长
交
于点
.直接写出
的值(用含
的式子表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/262a173a7cf68e06b4be175df69e2b74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b01700e039d8ef9005f21ce1b9ac8fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b01700e039d8ef9005f21ce1b9ac8fc.png)
(2)再探究一般情形.如图(1),证明(1)中的结论仍然成立.
问题拓展:如图(3),在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e385efcecb9698962975a432b70d047.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5ecc482b5968d904f0e04d0834e372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b01700e039d8ef9005f21ce1b9ac8fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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4440次组卷
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18卷引用:2022年湖北省武汉市中考数学真题
2022年湖北省武汉市中考数学真题(已下线)2022年湖北省武汉市中考数学真题变式题21-24题(已下线)专题15 相似三角形-2022年中考数学真题分项汇编(全国通用)(第1期)(已下线)第24课 相似三角形的性质 利用相似三角形测高-2022-2023学年九年级数学上册课后培优分级练(北师大版)(已下线)专题4.54 《图形的相似》挑战综合(压轴)题分类专题(专项练习)-2022-2023学年九年级数学上册基础知识专项讲练(北师大版)(已下线)第27章相似03单元测(已下线)专题27.49 《相似》挑战综合(压轴)题分类专题(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(人教版)(已下线)第五节 相似三角形03综合测(已下线)专题6.52 《图形的相似》挑战综合(压轴)题分类专题(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(苏科版)(已下线)数学(深圳卷)-学易金卷:2023年中考第一次模拟考试卷2023年辽宁省盘锦市兴隆台区中考一模数学试题2022年广东省梅州市丰顺县中考二模数学试题2023年湖南省衡阳市成章实验中学中考模拟数学试题2023年广东省深圳市东湖中学中考模拟数学试题2023年广东省深圳市龙园外语实验学校中考模拟数学试题(已下线)寒假作业08 相似三角形的性质与判定(16道经典题型+6道中考真题)-【寒假分层作业】2024年九年级数学寒假培优练(人教版)湖南省邵阳市新宁县新宁县三乡镇联考2023-2024学年九年级下学期月考数学试题2024年湖南省常德市安乡县中考一模数学试题
解题方法
8 . 问题背景:
如图1,在
中,
,
,
是
边上的中线,E是
上一点,将
绕点C逆时针旋转
得到
,
的延长线交边
于点P.问题探究:
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896605061906432/2935929912516608/STEM/cd90f2b6-810e-48ac-ba21-920b2f838d17.png?resizew=1063)
(1)探究
,
之和与
之间的数量关系.
①先将问题特殊化,如图2,当
时,直接写出
,
之和与
之间的数量关系;
②再探究一般情形,如图1,当
不垂直
时,证明①中的结论仍然成立;
(2)拓展探究:如图3,若
的延长线交
的延长线于点P时,直接写出一个等式,表示
,
,
之间的数量关系.
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/031852844b65eb8c3be10fcb6ed11196.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4ce3f962c91f0d3c7b998b5fbb37b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896605061906432/2935929912516608/STEM/cd90f2b6-810e-48ac-ba21-920b2f838d17.png?resizew=1063)
(1)探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
①先将问题特殊化,如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497846628a41a9bc750a645e045afb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
②再探究一般情形,如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)拓展探究:如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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9 . (1)问题探究:如图1,
,
均为等边三角形,连接
、
,求证:
.
(2)类比延伸:如图2,在
和
中,
,
,连接
、
,求证:
.
(3)拓展迁移:如图3,在四边形
中,
,且
,
,若将线段
绕点D按逆时针方向旋转
得到
,连接
,求线段
的长.
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
(2)类比延伸:如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e7ba6e267dde1a65a98f9f36b585ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd9776aa108071b50b71adf181bbdaf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cab3976641d2ad9aa50a30d4c8092cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4b798f9bb5482f0a3cfa1bfd77d245.png)
(3)拓展迁移:如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8049be7e7cd824771471bfac2bf70ae9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12daf5fea89631b84f896939c503d88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12daf5fea89631b84f896939c503d88a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/41453063-0eff-41ca-afbc-1280d661c17a.png?resizew=485)
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10 . 如图1,四边形OMTN中,OM =ON,TM =TN,我们把这种两组邻边相等的四边形叫做筝形.
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897725544472576/2915514945413120/STEM/c10b3ba0-78a8-4e6e-8623-293f8ad8d4a0.png?resizew=542)
(1)探究结论:试探究筝形对角线之间的位置关系,并证明你的结论;
(2)尝试应用:如图2,在筝形ABCD中,已知DC=AD=10,AB=CB,BC>CD,BD,AC为对角线,AC=16.若存在一个圆使得A,B,C,D四个点都在这个圆上,试求出这个圆的半径;
(3)拓展延伸:如图,将正方形ABCD绕点B逆时针旋转30°,得到正方形GBEF,AD与EF相交于点K,延长DA交GF于点H.①证明四边形KABE是筝形 ;②若AB=
,求AH的长.
![](https://img.xkw.com/dksih/QBM/2022/1/19/2897725544472576/2915514945413120/STEM/c10b3ba0-78a8-4e6e-8623-293f8ad8d4a0.png?resizew=542)
(1)探究结论:试探究筝形对角线之间的位置关系,并证明你的结论;
(2)尝试应用:如图2,在筝形ABCD中,已知DC=AD=10,AB=CB,BC>CD,BD,AC为对角线,AC=16.若存在一个圆使得A,B,C,D四个点都在这个圆上,试求出这个圆的半径;
(3)拓展延伸:如图,将正方形ABCD绕点B逆时针旋转30°,得到正方形GBEF,AD与EF相交于点K,延长DA交GF于点H.①证明四边形KABE是筝形 ;②若AB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
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2022-02-13更新
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174次组卷
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3卷引用:湖北省荆州市江陵县2021-2022学年九年级上学期期末数学试题