如图1,在
中,
,等腰直角三角形BDE的顶点点D是边
上的一点,且
,过点D作
边的垂线,交
边于点E,将
绕点B顺时针方向旋转,记旋转角为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/90bfb125-a7a3-4ec1-9b98-7461773e4768.png?resizew=209)
(1)【问题发现】当
时,
的值为________,直线
相交形成的较小角的度数为________;
(2)【拓展探究】试判断:在旋转过程中,(1)中的两个结论有无变化?请仅就图2的情况给出证明;
(3)【问题解决】当
旋转至A,D,E三点在同一条直线上时,请直接写出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e05e869542daa21aaca01417c5a2497b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d6bdfb0e1be5583e794ab614a8abe1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b97a81538ab92a18236b676ee94d94.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/90bfb125-a7a3-4ec1-9b98-7461773e4768.png?resizew=209)
(1)【问题发现】当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e7e8c4e8015bc1a44a89460e1dc0d63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79649c83692409ee5fae09331d835f5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28d28b62b82aba68a82d25ca777016f7.png)
(2)【拓展探究】试判断:在旋转过程中,(1)中的两个结论有无变化?请仅就图2的情况给出证明;
(3)【问题解决】当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
21-22九年级上·河南·期末 查看更多[4]
河南师大附中、新乡学院附中联考2021-2022学年九年级上学期期末数学试题2022年河南省南阳市卧龙区九年级第一次模拟考试数学试卷(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)
更新时间:2022-05-02 19:52:24
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真题
【推荐1】在△ABC中,AB=6,AC=BC=5,将△ABC绕点A按顺时针方向旋转,得到△ADE,旋转角为α(0°<α<180°),点B的对应点为点D,点C的对应点为点E,连接BD,BE.
(1)如图,当α=60°时,延长BE交AD于点F.
①求证:△ABD是等边三角形;
②求证:BF⊥AD,AF=DF;
③请直接写出BE的长;
(2)在旋转过程中,过点D作DG垂直于直线AB,垂足为点G,连接CE,当∠DAG=∠ACB,且线段DG与线段AE无公共点时,请直接写出BE+CE的值.
(1)如图,当α=60°时,延长BE交AD于点F.
①求证:△ABD是等边三角形;
②求证:BF⊥AD,AF=DF;
③请直接写出BE的长;
(2)在旋转过程中,过点D作DG垂直于直线AB,垂足为点G,连接CE,当∠DAG=∠ACB,且线段DG与线段AE无公共点时,请直接写出BE+CE的值.
![](https://img.xkw.com/dksih/QBM/2017/6/1/1699586291957760/1700781203357696/STEM/6882f172589947a48c89fa741fe50f42.png?resizew=271)
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【推荐2】如图1,直角△DEF与直角△ABC的斜边在同一直线上,∠EDF=36°,∠ABC=40°,CD平分∠ACB,将△DEF绕点D按逆时针方向旋转,记∠ADF为α(0<α<180°),在旋转过程中:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/7a6eff70-5bdb-4574-970a-72e82606b719.png?resizew=596)
(1)如图2,当∠α= 时,DE
BC;当∠α= 时,DE⊥BC;
(2)如图3,当顶点C在△DEF内部时,边DF、DE分别交BC、AC的延长线于点M、N.
①此时∠α的度数范围是 ;
②∠1与∠2度数的和是否变化?若不变,求出∠1与∠2度数和;若变化,请说明理由.
③当∠2≥2∠1时,直接写出∠α的度数范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/7a6eff70-5bdb-4574-970a-72e82606b719.png?resizew=596)
(1)如图2,当∠α= 时,DE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(2)如图3,当顶点C在△DEF内部时,边DF、DE分别交BC、AC的延长线于点M、N.
①此时∠α的度数范围是 ;
②∠1与∠2度数的和是否变化?若不变,求出∠1与∠2度数和;若变化,请说明理由.
③当∠2≥2∠1时,直接写出∠α的度数范围.
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解答题-作图题
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【推荐3】如图
,直角三角形
与直角三角形
的斜边在同一直线上,
,
平分
,将
绕点
按逆时针方向旋转,记
为
,在旋转过程中:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/13a700a3-3e3d-48d3-b440-b202849b24da.png?resizew=537)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/660836ba-c0b9-4b5b-95c1-f1f55798fb42.png?resizew=494)
(1)如图
,
,当
______时,
,当
______时,
;
(2)如图
,
,当顶点
在
内部时(不包含边界)
,边
、
分别交
、
的延长线于点
、
,
①此时
的度数范围是______.
②
与
度数的和是否变化?若不变,求出
与
的度数和;若变化,请说明理由:______.
(3)如图
,将
绕点
按逆时针方向旋转过程中,边
与射线
有交点
,边
与射线
有交点
,则
与
有什么关系______.
(4)如图
,将
绕点
按逆时针方向旋转过程中,边
与射线
有交点
,边
与射线
有交点
、请在备用图中画出其他可能位置,并写出
与
的关系______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e5963f42d4195661bb0860b8d6c18d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.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/a7316430d26a6f4bcc0bdadfd1a5330a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0c6b3ac303e83e204a619ac3d5e1bf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/13a700a3-3e3d-48d3-b440-b202849b24da.png?resizew=537)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/660836ba-c0b9-4b5b-95c1-f1f55798fb42.png?resizew=494)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a70f42dccbe717bd85872938e26412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdcee5cf673e4e2bf0c60661c9037f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdcee5cf673e4e2bf0c60661c9037f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a70f42dccbe717bd85872938e26412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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)
①此时
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed2884b46c0b3b258154b393777e966a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d650c9cf6ee86c87851e24d1dc09743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed2884b46c0b3b258154b393777e966a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d650c9cf6ee86c87851e24d1dc09743b.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbf1667b21a273bf5dd007d65eeda7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3b2af99e51b5802da071a079adef40b.png)
(4)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbf1667b21a273bf5dd007d65eeda7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3b2af99e51b5802da071a079adef40b.png)
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解答题-证明题
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名校
【推荐1】如图,在平面直角坐标系xOy中,抛物线y=
x2+mx+n经过点B(6,1),C(5,0),且与y轴交于点A.
(1)求抛物线的表达式及点A的坐标;
(2)点P是y轴右侧抛物线上的一点,过点P作PQ⊥OA,交线段OA的延长线于点Q,如果∠PAB=45°.求证:△PQA∽△ACB;
(3)若点F是线段AB(不包含端点)上的一点,且点F关于AC的对称点F′恰好在上述抛物线上,求FF′的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(1)求抛物线的表达式及点A的坐标;
(2)点P是y轴右侧抛物线上的一点,过点P作PQ⊥OA,交线段OA的延长线于点Q,如果∠PAB=45°.求证:△PQA∽△ACB;
(3)若点F是线段AB(不包含端点)上的一点,且点F关于AC的对称点F′恰好在上述抛物线上,求FF′的长.
![](https://img.xkw.com/dksih/QBM/2020/2/8/2394413872545792/2394676331257856/STEM/4b2be6c10678408d957cf95a1d2c054f.png?resizew=211)
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【推荐2】如图,抛物线
交
轴于
,
两点,交
轴于点
,点
是抛物线上一个动点.
(2)当点
的坐标为
时,求四边形
的面积;
(3)当动点
在直线
上方时,在平面直角坐标系内是否存在点
,使得以
,
,
,
为顶点的四边形是矩形?若存在,请求出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77c0c5cad5bc172406ed888808852f85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d57173ef4cd72eb270686875dfd623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f36488f7dff759ace2a27e56c3857056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20feb7bb2bf1bd381dc2b3f7b5d2abda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a31c168b883daa13e8a284c1770527b5.png)
(3)当动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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解答题-证明题
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名校
【推荐1】教材呈现:
(2)初步探究:如图2,在四边形
中,
,
,
,
于点P,连接
,
.
①
的度数为 .
②求
的长.
(3)拓展运用:如图3,在平行四边形
中,F是
边上一点,
,
,
.按以下步骤作图:①以点B为圆心,以适当的长为半径作弧,分别交
,
于点M,N;②分别以点M,N为圆心,大于
的长为半径作弧,两弧交于点E,作射线
.过点F作
交
于点P,过点P作
于点G,Q为射线
上一动点,连接
,
,若
,直接写出
的值.
例:如图1,在![]() ![]() ![]() ![]() 求证: ![]() 证明:延长 ![]() ![]() ![]() ![]() ……
|
(2)初步探究:如图2,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/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45723dce96b74f027adcb1a4ecd19db8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5ea309886e947ea7cb4b81716206fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96c5e7ab5a46dd74168a6555fd6bf6b6.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)拓展运用:如图3,在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faffe3765c15f53305516895aa595a9b.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/c94e1ca12da27075e5241b7c7ce74672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d620c2be45414bb73c591aef51469271.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73d7566369c178316219bb466a66d062.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e66b12019cdf68327d34c90dff7c04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22072cf9e5d4259f8f51e5c94490bf93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/013d609ef2ded6729da96280cc95fdac.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图,
的半径为5,
是
的直径,弦
于点F,
,P是
上一点,连接
交
于点E,连接
交
于点G,
的延长线与
的延长线交于点Q.
,求证:
;
(2)在(1)的条件下,求线段
的长;
(3)如果
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/682c416aeea1d4d3bf2a4b128a60e3e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.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/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ca08cdea0d1da2945dcc8a9d8feb0c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f163ea5d347198d0afe7f66f5d28849.png)
(2)在(1)的条件下,求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5a7730d36021f3e894234b81e4e9a5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7fbd6b9f85c086ac95562fe45e8d969.png)
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解答题-问答题
|
较难
(0.4)
【推荐1】综合与实践:图形的几何变换
复习课上,老师对一张平行四边形纸片
进行如下操作:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/f3c364af-93c6-43e8-a54d-b66d224ac674.png?resizew=909)
(1)如图1,折叠该纸片,使边
恰好落在边
上,边
恰好落在边
上,得到折痕
和
,判断四边形
的形状,并说明理由;
(2)老师沿折痕将
和
剪下,得到两个全等的等腰三角形,已知等腰三角形的腰长为5,底边长为6,底角度数为a,通过不同的摆放方式,三个学习小组利用几何变换设置了几个问题,请一一解答.
①善思小组:将两个三角形摆放成如图2的位置,使边
与边
重合,然后固定
,将
沿着射线
的方向平移(如图3),当四边形
为矩形时,求平移的距离.
②勤学小组:将两个三角形摆成如图4的位置,使
与
重合,取
的中点O,固定
,将
绕着点O按逆时针方向旋转(
旋转角
),如图5,在旋转过程中,四边形
的形状是______.
③奋进小组:在②勤学小组的旋转过程中,利用图6进行探究,当
与
的重叠部分为等腰三角形时,旋转角为______(用含
的代数式表示),此时重叠部分的面积为_____.
复习课上,老师对一张平行四边形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2c6c3cc1875ad112d8c4eac793337c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/f3c364af-93c6-43e8-a54d-b66d224ac674.png?resizew=909)
(1)如图1,折叠该纸片,使边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971b23e3ee827018557d6c88edd5369a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e41003131c669f518bc8485620486fa.png)
(2)老师沿折痕将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
①善思小组:将两个三角形摆放成如图2的位置,使边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8faa67131a39f719be1871606b7927c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8faa67131a39f719be1871606b7927c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dba79f4bea38f3540112f47ed69700e.png)
②勤学小组:将两个三角形摆成如图4的位置,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad09a769a75b107390b9eeccc929f761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a37ba261860ddad9d11b2e8348a8f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5720a5e4a2d3d32b98dd53b3ff6c8735.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d5f3d86127a638b960ee3f4390e0bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92aebf57b643a2b3323d5217be661078.png)
③奋进小组:在②勤学小组的旋转过程中,利用图6进行探究,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad09a769a75b107390b9eeccc929f761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a37ba261860ddad9d11b2e8348a8f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
解题方法
【推荐2】如图1,在△ABC中,AB=AC,
. 过点A作BC的平行线与∠ABC的平分线交于点D,连接CD.
![](https://img.xkw.com/dksih/QBM/2013/6/14/1573663540977664/1573663546720256/STEM/6556a094-1d58-4620-8cce-f505cdb56db1.png?resizew=468)
(1)求证:
;
(2)点
为线段
延长线上一点,将射线GC绕着点G逆时针旋转
,与射线BD交于点E.
①若
,
,如图2所示,求证:
;
②若
,
,请直接写出
的值(用含
的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597ce705d3a2fe04d29de9e81ec6250d.png)
![](https://img.xkw.com/dksih/QBM/2013/6/14/1573663540977664/1573663546720256/STEM/6556a094-1d58-4620-8cce-f505cdb56db1.png?resizew=468)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ee81929c987732fcb379802eeef7a7.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6be32a39d99bbd36fff0d12a2708d268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2cb8d279dcbbab395b224eb23945b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b5fa9843496ad71d8ed77292b50eeea.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dfab465486d4a4d33480f6a11ebf7ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9d5deb26fc3e22a9ac83b0e18b8dfc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1943daad8ff947f91fd85c355bab264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次