1 . 【问题提出】
如图1,在正方形
中,点E,F分别在
边上,且
,连接
.探究线段
之间的数量关系.
【方法感悟】
(1)小明组同学利用构造全等三角形的方法探究三条线段的关系:如图2,延长
到点G,使
,连接
,先证明
,再证明
,从而得到正确结论.小明组同学的结论是___________;
小亮组同学对小明组构造全等三角形的环节提出了不同的看法,借助旋转三角形的方式探究问题:将
绕点A顺时针旋转90°得到
,再证明
,从而得到与小明组相同的结论.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/4194d793-1550-4e2e-aa10-0f8a33d87114.png?resizew=302)
【方法迁移】
(2)如图3,在
中,
,沿边
翻折得到
,点B的对应点为点D,点E,F分别在
边上,且
.试猜想线段
之间的数量关系,并证明你的猜想.
【问题拓展】
(3)如图4,在四边形ABCD中,
,点E,F分别在
边上,且
,试猜想当
与
满足什么关系时,可使得
.请直接写出你的猜想.
(4)如图5,在四边形
中,
,
,
与
为对角线,
.若
,
,求
的长.
如图1,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ced9844fe2e052c70486af0740afa63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180942edc839b9fda741b055df87216b.png)
【方法感悟】
(1)小明组同学利用构造全等三角形的方法探究三条线段的关系:如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b555a0bb6b5132ecfb9cae3769912c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828d0ee008783093cbe6de3f5147bcb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7d143a1d6ba708f17021e41efd7d9a.png)
小亮组同学对小明组构造全等三角形的环节提出了不同的看法,借助旋转三角形的方式探究问题:将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc727c642cbc2181476b7dd8eca471e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7d143a1d6ba708f17021e41efd7d9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/4194d793-1550-4e2e-aa10-0f8a33d87114.png?resizew=302)
【方法迁移】
(2)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ced9844fe2e052c70486af0740afa63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a6aef04eceb608a7a2cfc3e566f9e8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180942edc839b9fda741b055df87216b.png)
【问题拓展】
(3)如图4,在四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ced9844fe2e052c70486af0740afa63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a6aef04eceb608a7a2cfc3e566f9e8b.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/2a99627df7b1a88b9bf3dda20390d245.png)
(4)如图5,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7305de9211785b826823153897b17517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669f7a1e43ef893ef3a45fc47992947f.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/b2915ea6f8ea0cb67a6b135ff275b4e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/7872072e-8e14-41b4-88ca-a0923e1c29d7.png?resizew=459)
您最近一年使用:0次
2024-01-10更新
|
388次组卷
|
3卷引用:辽宁省沈阳市于洪区2023-2024学年九年级上学期期末数学试题
2 .
和
均为等边三角形,O分别为
和
的中点,连接
,
,
.
(1)【特例发现】如图1,当点D,点E与点F分别在
上时,可以得出结论:
______;直线
与直线
的位置关系是______.
(2)【探究证明】如图2,将图1中的
绕点O顺时针旋转,使点D恰好落在线段
上,连接
.(1)中的结论是否仍然成立?若成立,请证明;若不成立,请说明理由.
(3)【拓展运用】如图3,将图1中的
绕点O顺时针旋转
,连接
,它们的延长线交于点H,当
时:
①连接
,判断四边形
的形状,并给予证明;
②直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.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/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eeb94acdc3de00655e6e29d5372da09.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/26/44be64e4-7a95-45e9-8a16-19388e4b2b11.png?resizew=569)
(1)【特例发现】如图1,当点D,点E与点F分别在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ffcc3118295b1b773283fdd9b1ca02c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e93e7c5ddc457a60dbd739ae9fede84f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(2)【探究证明】如图2,将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)【拓展运用】如图3,将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64a906b77dd91b2ee627116177376546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8f04c682c5c92221c6ea670200f06b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36163961b044f887edc492954b90343b.png)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50740d0728b001e32417f377925c5af1.png)
②直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee0b6b626c5cb1e808aeba1ea4e0c4b.png)
您最近一年使用:0次
名校
解题方法
3 . (1)如图1,在正方形
中,点
,
分别是
,
上的两点,连接
,
,若
,则
的值为_________;
(2)如图2,在矩形
中,
,
,点
是
上的一点,连接
,
,若
,则
的值为_________;
【类比探究】
(3)如图3,在四边形
中,
,点
为
上一点,连接
,过点
作
的垂线交
的延长线于点
,交
的延长线于点
,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb545c1a90c841d0d25070cf62b64e3.png)
【拓展延伸】
(4)如图4,在
中,
,
,
,将
沿
翻折,点
落在点
处,得到
,点
,
分别在边
,
上,连接
,
,若
,则
的值为_________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
(2)如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c1e75eb744576c32eed3f9d20f9558.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29315b499c8a01b20e1637b2add1dcbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8775dcf60ad143bc59a58b000f374c56.png)
【类比探究】
(3)如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41aba1711910c6f533cc94319104f4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.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/ccb545c1a90c841d0d25070cf62b64e3.png)
【拓展延伸】
(4)如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ab0e3f4783faa57520f1f9dff63439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a306417e43670260e4b68a928a22071f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce552d6e4e8bca4d93e5cb01d8685600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73636989e83905f8800a865c2b608c43.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ada5e380d6b5b2066e34497e5f0baf0.png)
![](https://img.xkw.com/dksih/QBM/2022/6/5/2994677817606144/3084695268409344/STEM/1df1ca18cbf94de2bb788fe177094438.png?resizew=516)
您最近一年使用:0次
2022-10-10更新
|
673次组卷
|
6卷引用:山东省青岛市市南区2021-2022学年九年级上学期期末数学试题
4 . 【阅读思考】
在平面直角坐标系
中,点
的坐标分别
,
且
,点
是平面内一点,连接
.定义:在上述条件下,若
,则称点
是
的智慧点,记作
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/d4dd91c7-f6d2-4c76-93bf-fecf8c20babf.png?resizew=309)
【初步探究】
(1)如图1,
分别在
轴、
轴的正半轴上.
①若
,
,
,求证:点
是
的智慧点;
②若
,用含
的式子表示点
的坐标.(直接写出答案)
【理解应用】
(2)若
,
,且
,求
的值.
【拓展迁移】
(3)若
,
,点
,且
,求点
的坐标.
在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d345e61f024bf07329cd27dc0bfadcf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64ba819698caf577d2d2d4c598c0f50a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eae9ba258299eb489b490594397e23c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba85e0d27c9dfb7be464ecf135f3e094.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/931813dbb01614b3de5d6f416203dabb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372a8b74554296a4d12fcf28165c1c3c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/d4dd91c7-f6d2-4c76-93bf-fecf8c20babf.png?resizew=309)
【初步探究】
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c355f11471a38f5583a434a1ddeb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18c777c09623824075b49fd91f8a5b7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372a8b74554296a4d12fcf28165c1c3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ff2912fd8d93b6e692936d95b727c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
【理解应用】
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372a8b74554296a4d12fcf28165c1c3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c3361f3a17a971558914bb4a5b88a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d12fefd3a33b28372260f1ba5d946efb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
【拓展迁移】
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c43f704b5d150cb4e29e9796a07d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0b442751d96abcc200750fb2bcdff93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
名校
5 . (1)[阅读与证明]
如图1,在正△ABC的外角∠CAH内引射线AM,作点C关于AM的对称点E(点E在∠CAH内),连接BE,BE、CE分别交AM于点F、G.
∴∠AGE=90°,AE=AC,∠1=∠2.
∵正△ABC中,∠BAC=60°,AB=AC,
∴AE=AB,得∠3=∠4.
在△ABE中,∠1+∠2+60°+∠3+∠4=180°,∴∠1+∠3= °.
在△AEG中,∠FEG+∠3+∠1=90°,∴∠FEG= °.
②求证:BF=AF+2FG.
(2)[类比与探究]
把(1)中的“正△ABC”改为“正方形ABDC”,其余条件不变,如图2.类比探究,可得:
②线段BF、AF、FG之间存在数量关系 .
(3)[归纳与拓展]
如图3,点A在射线BH上,AB=AC,∠BAC=α(0°<α<180°),在∠CAH内引射线AM,作点C关于AM的对称点E(点E在∠CAH内),连接BE,BE、CE分别交AM于点F、G.则线段BF、AF、GF之间的数量关系为 .
如图1,在正△ABC的外角∠CAH内引射线AM,作点C关于AM的对称点E(点E在∠CAH内),连接BE,BE、CE分别交AM于点F、G.
∴∠AGE=90°,AE=AC,∠1=∠2.
∵正△ABC中,∠BAC=60°,AB=AC,
∴AE=AB,得∠3=∠4.
在△ABE中,∠1+∠2+60°+∠3+∠4=180°,∴∠1+∠3= °.
在△AEG中,∠FEG+∠3+∠1=90°,∴∠FEG= °.
②求证:BF=AF+2FG.
(2)[类比与探究]
把(1)中的“正△ABC”改为“正方形ABDC”,其余条件不变,如图2.类比探究,可得:
②线段BF、AF、FG之间存在数量关系 .
(3)[归纳与拓展]
如图3,点A在射线BH上,AB=AC,∠BAC=α(0°<α<180°),在∠CAH内引射线AM,作点C关于AM的对称点E(点E在∠CAH内),连接BE,BE、CE分别交AM于点F、G.则线段BF、AF、GF之间的数量关系为 .
您最近一年使用:0次
2022-10-06更新
|
204次组卷
|
3卷引用:2022年广东省深圳市九年级中考数学模拟试卷
6 . 如图1,已知点
在正方形
的对角线
上,
,垂足为点
,
,垂足为点
.易得四边形
为正方形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/a9676852-3a44-4ffd-920a-54ac0f46037a.png?resizew=405)
(1)推断:
的值为________;(直接写出结果)
(2)探究与证明:将正方形
绕点
顺时针方向旋转
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
,
,
三点在一条直线上时,如图3所示,延长
交
于点
.若
,
.
①证明:
;
②求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7fe55d17f5ca49389dd2cb1ab74ac2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920ae90193d50ae60beafae6f2b4ebcd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/a9676852-3a44-4ffd-920a-54ac0f46037a.png?resizew=405)
(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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27a80c9d8646d438a106b94efcefe9bd.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/7f9e8449aad35c5d840a3395ea86df6d.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/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7978151ee28b5d0b797786526d303d21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea88e1806b38ad1e335bdfc4612809c6.png)
①证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9289c3577bfa3ec5e261c34e345f445c.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次
7 . 【探究发现】如图1,正方形
的对角线交于点O,E是
边上一点,作
交
于点F;学习小队发现,不论点E在
边上运动过程中,
与
恒全等.请你证明这个结论;
【类比迁移】如图2,矩形
的对角线交于点O,
,E是
延长线上一点,将
绕点O逆时针旋转
得到
,点F恰好落在
的延长线上,求
的值;
【拓展提升】如图3,等腰
中,
,点E是
边上一点,以
为边在
的上方作等边
,连接
,取
的中点M,连接
,当
时,直接写出
的长.
![](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/dc2eaf2acb7e954cc0c4aacdc1f29f34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd5a1e516644950ef35eafd859b262f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20c525358262126a51fbb598d58f3e1a.png)
【类比迁移】如图2,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2aabb3232e9ffabad9def25515cbdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5ca1cff7e12ceae15df29736638545a.png)
【拓展提升】如图3,等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb80a41fb9cdc3126109f2f5aeda477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2cf32ecfaa726957e0fbfae6df3b47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/25/1f5d211b-d237-4fb2-bc0c-19cd3528c01e.png?resizew=565)
您最近一年使用:0次
8 . 综合与实践课上,老师让同学们以“矩形的折叠”为主题开展数学活动.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/27/c139253a-2d44-4fd9-8b1b-37ebf61dc458.png?resizew=465)
(1)操作判断
操作一:对折矩形纸片
,使
与
重合,把纸片展平,得到折痕
;
操作二:在
上选一点P,沿
折叠,使点A落在矩形内部点Q处,把纸片展平,连接
.根据以上操作,当点Q在
上(如图1)时,
.
(2)迁移探究
小华将矩形纸片换成正方形纸片,继续探究,过程如下:
将正方形纸片ABCD按照(1)中的方式操作,并延长
交
于点G,连接
.对角线
与
分别交于点M、N,连接
.当点Q在
上(如图2)时,判断线段
与
的位置关系,并说明理由;
(3)拓展应用
在(2)的探究中,改变点P在
上的位置,当点G在线段
上时(如图3),若正方形的边长为
,
,求
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/27/c139253a-2d44-4fd9-8b1b-37ebf61dc458.png?resizew=465)
(1)操作判断
操作一:对折矩形纸片
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
操作二:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fae2c2d53116789cdd9ae26d73904e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca80a65f476341efad28539ad6877e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)迁移探究
小华将矩形纸片换成正方形纸片,继续探究,过程如下:
将正方形纸片ABCD按照(1)中的方式操作,并延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f451f0e75fd9b719000f69772a1df5bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
(3)拓展应用
在(2)的探究中,改变点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27567d43c5b91382ee3d7ca708ee422.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6c3ec6ee03bb1119c5e619d1dd81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd866f5147796891413ed189ef849e96.png)
您最近一年使用:0次
9 . 综合与实践
问题背景:在
中,
,点D在
边上 (不与点A、C重合).
于E,连结
,F为线段
的中点.
(1)问题发现:
若
,如图1,连接
、
,则线段
与
之间的关系为 ;
(2)探究证明:
如图2,在(1)的条件下,将图
中的
绕点A顺时针旋转,使得D、E、B三点共线,F为线段
的中点,连接
,探究线段
,
之间的数量关系,并证明;
(3)拓展延伸:
如图3,若
,
,
,将
绕点A顺时针旋转,当D,E,B三点共线时,F为
的中点,连结
,求
的长.
问题背景:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9b7411dc53e7be87f18053093e4e97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20e5d585fbf903ee5affa6d083ab95f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/9f6bc44d-e954-4f53-beb2-17b1bcb016a1.jpg?resizew=394)
(1)问题发现:
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84b8df29285596ada928719e9697dd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
(2)探究证明:
如图2,在(1)的条件下,将图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefe4a3e7a7fa195ed6a6712447639b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0c0884ab2df9c7df3431c5528d9fbec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
(3)拓展延伸:
如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c9efd52ec4af254022b6e4418adb99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc9f0779b0ba2f9f97caf35c166ad24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6166b9a5437671bcba31e17c375eb39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefe4a3e7a7fa195ed6a6712447639b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
您最近一年使用:0次
2023-11-25更新
|
113次组卷
|
2卷引用:辽宁省大连市高新技术产业园区2023-2024学年九年级上学期期中数学试题
10 . 探究完成以下问题:
【初步认识】
(1)如图1,在四边形
中,
,连接
,
,过点
作
交
的延长线于点
.求证:
;
【特例研究】
(2)如图2,若四边形
中,
,(1)中的其它条件不变,取
,
的中点M,F,连接
.
①求证:
;
②N为
的中点,连接
,猜想
与
的位置关系,并证明你的猜想;
【拓展应用】
(3)如图3,在矩形
中,对角线
,
相交于点O,E是射线
上一动点,过点
作
交射线
于点
,当
,
,
时,请直接写出
的长.
【初步认识】
(1)如图1,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b6e08fde74010412a6f14ad4dfbcc9.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea542c31170157c0e9b9e8b65a95437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90f282c768c4178b7bb0b769dc11497f.png)
【特例研究】
(2)如图2,若四边形
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d90fcc742bc0b6dbe2824cec9c9ea097.png)
②N为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
【拓展应用】
(3)如图3,在矩形
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc2eaf2acb7e954cc0c4aacdc1f29f34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14df36d39d07256d631f52e6a65375b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348fb71fbc47fd87e9ce011652ef4186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/16/2462b9cd-9bb4-466c-8751-213fde6eff4a.png?resizew=535)
您最近一年使用:0次