1 . 【模型学习】
构造“平行8字型”全等三角形模型是证明线段相等的一种方法.例如:如图1,D是
的边
上一点,E是
的中点,过点C作
,交
的延长线于点F,可得到
.
(1)如图2,在正方形
中,点E是
上一点,点F是
的延长线上一点,且满足
,连接
交
于点G,求证:
;
【深入探究】
(2)如图2,在(1)的条件下,连接
并延长,交
于点H,若
,
,求正方形的边长;
【拓展迁移】
(3)如图3,在矩形
中,
,点E在
上,点F在
的延长线上,且满足
,连接
交
于点G.判断
与
之间的数量关系,并说明理由.
构造“平行8字型”全等三角形模型是证明线段相等的一种方法.例如:如图1,D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9f641563e8533a5bb39188aa7cc182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/471dd62814e107c3489c0527e00e2696.png)
(1)如图2,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3379f93f65cfb92526ffc4a9859cbded.png)
【深入探究】
(2)如图2,在(1)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc384f3053d4e39320d2267dc4f08eae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662a9a633cdf3c5f19105025d69fc089.png)
【拓展迁移】
(3)如图3,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5181b97a7e43959b8455680157c3b644.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/5f8fe122a768a4d78b5b39817d557a04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
您最近一年使用:0次
2024九年级下·全国·专题练习
2 . (1)【问题探究】如图1,正方形
中,点
、
分别在边
、
上,且
于点
,求证:
;
(2)【知识迁移】如图2,矩形
中,
,
,点
、
、
、
分别在边
、
、
、
上,且
于点
.若
,求
的长;
(3)【拓展应用】如图3,在菱形
中,
,
,点
在直线
上,
,
交直线
于点
.请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c627c657d0139d1c7cc99ddb83f1a09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e9256e0961f04e2b896f394f0a1f52e.png)
(2)【知识迁移】如图2,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846b1b49f05812b0761eb565062d32f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f69ee342c8969b6c71ebd1c08e2798e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
(3)【拓展应用】如图3,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.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/620fd368efb51a5ae90c0f3e276704d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/876bb8ce0ca53475fa091ffd18bdc94a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
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3 . 已知两个矩形,若其中一个矩形的四个顶点分别在另一个矩形的四条边上(顶点不重合),我们称这个矩形为另一个矩形的“衍生矩形”.
【模型探究】(1)如图1,矩形
是矩形
的“衍生矩形”,不连接其它线段,图中有哪几组全等三角形,请写出并任选一组证明;
【迁移应用】(2)如图2,在矩形
中,
,
.点M在线段
上,且
,点N是
边上的动点,连接
,以
为边作矩形
,点P在
边上,点Q落在矩形
内.连接
,
,当
面积为
时,求
的长;
【拓展延伸】(3)如图3,在矩形
中,
,
.点N是
的中点,点M是
边上的动点,连接
,以
为边作矩形
,点P在
边上,点Q始终落在矩形
内(不含边界).连接
,点O是
的中点,连接
,求
长的取值范围(用含a,b的式子表示).
【模型探究】(1)如图1,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
【迁移应用】(2)如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e0c5cb53fd85b7a23f0580df6bb49a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74a973f7b8e6acbd272a931d750d48b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/389bc3f29c058067e06e0d0d2be399da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/217d37ca5469a57cb7417a2ac0d58efe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec85f29c0860b57a8f0cf8098c13a97e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
【拓展延伸】(3)如图3,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4217f4375caaeef4d4221143d5f6bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9993bc6f3dd6a629b0c73189eebd9a2f.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/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1a3eb9576531c4ca1077be7cb5ef14b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1a3eb9576531c4ca1077be7cb5ef14b.png)
您最近一年使用:0次
2024-06-13更新
|
100次组卷
|
2卷引用:2024年四川省成都市锦江区九年级中考二诊模拟考试数学试题
4 . 【问题情境】在数学活动课上,奋飞组的同学在延时课上用两张矩形纸片进行探究活动.小组同学准备了两张矩形纸片
和
,其中
,
,将它们按如图1所示的方式放置,点E,G分别落在
,
边上时,点E,G恰好为边
,
的中点.然后将矩形纸片
绕点B按顺时针方向旋转,旋转角为α,连接
与
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/21/88db2e31-b28a-4ba6-9d12-a0e4de223170.png?resizew=423)
【观察发现】
(1)如图2所示,当
时,小组成员发现
与
存在的数量关系为______;位置关系为______;
【探索猜想】
(2)如图3所示,当
时,(1)中发现的结论是否仍然成立?请说明理由;
【拓展延伸】
(3)在矩形
的旋转过程中,连接
,
,得
为定值,请直接写出此定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10eec76d00779458ce81639d71c635d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e279ad372652147be73c8a834734df0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/21/88db2e31-b28a-4ba6-9d12-a0e4de223170.png?resizew=423)
【观察发现】
(1)如图2所示,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
【探索猜想】
(2)如图3所示,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13b5ea2fc43b19ca043581eb94197234.png)
【拓展延伸】
(3)在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a10eec76d00779458ce81639d71c635d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b348cef81feb80ed7e79a5d9e67ef48d.png)
您最近一年使用:0次
5 . 综合与实践
问题情景:
如图
,矩形
中,
,
,点
、点
分别是
和
的中点,连接
,将
绕点
顺时针旋转
(
),连接
,
,延长
交
于点
.
(1)如图
,当四边形
是矩形时,求旋转角
的正切值;
(2)当
旋转到图
的情况时,探究
,
,
的数量关系;
拓展应用:
(3)在(
)的条件下,
旋转的过程中,若
,请直接写出
的长度.
问题情景:
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708d48b595c17d4dccf9b4086d7e664e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2746836e6b83bc9462db060d6b72d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
拓展应用:
(3)在(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0a673ecfe58973cc19acec05c50a648.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
您最近一年使用:0次
6 . (1)问题发现:如图1,在
和
中,
,
,连接
,填空:
;
;
(2)类比探究:如图2,在
和
中,
,连接
交
的延长线于点M,请判断
,并说明理由;
(3)拓展延伸:如图3,在(2)的条件下,将
绕点O旋转至点C与点M重合,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd4ae5d33fdc0a501b876dcfc6b5b54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
,填空:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2255c5ec3e056f67109c29e56cf8aa74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1397f20656d3a4117f3145102105244.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b521c99e1f87bfb16c2060393482d71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b0594893c40c5578051097ccad61e0.png)
(2)类比探究:如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a20118349af7f5d14f8ef63e3a695dd.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/11c0fed1bec279a67db01c918711d4f5.png)
(3)拓展延伸:如图3,在(2)的条件下,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd4ae5d33fdc0a501b876dcfc6b5b54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c154be32bfa30e4c463c6085b0c8912.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae248960d8c1677cf948f8251275e863.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/f1810f13-84c8-4b42-b007-e3f1c457d825.png?resizew=550)
您最近一年使用:0次
名校
7 . 小新同学在数学探究课上,用几何画板进行了如下操作:首先画一个正方形
,一条线段![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
,再以点A为圆心,
的长为半径,画
分别交
于点E,交
于点G,过点E,G分别作
、
的垂线交于点F,易得四边形
也是正方形,连接
.
①
与
的大小关系:______;
②
与
的大小和位置关系:______.
(2)【尝试证明】如图2,将正方形
绕圆心A转动,在旋转过程中,上述①②中的关系还存在吗?请说明理由.
(3)【思维拓展】如图3,若
,则:
①在旋转过程中,点B,A,G三点共线时,
的值为______;
②在旋转过程中,
的最大值是______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dae6473d0feaf71d36c5a2d24313db6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
(2)【尝试证明】如图2,将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
(3)【思维拓展】如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/881afead8f7fe2064149138221b5ed98.png)
①在旋转过程中,点B,A,G三点共线时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
②在旋转过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
您最近一年使用:0次
2024-05-01更新
|
75次组卷
|
2卷引用:江西省吉安市2023-2024学年九年级下学期期中数学试题
名校
8 . 在平行四边形
中,
点E,F分别为线段
和
延长线上的点,连接
与
交于点G,连接
,设
.
【问题提出】(1)如图1,延长
交
于点P,求证:
=
;
【深入探究】(2)如图2,若
,求
的最小值;
【拓展提高】(3)如图3,若
,当
时,直接写出k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db9bbb8b6fa72e306b4c4771d33949f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ddcc7a77ea95269a7b87543be5c9ad.png)
【问题提出】(1)如图1,延长
![](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/e253f26da9c7c4b5e8fcfac3ca0f168d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f692d0437e200690eabcd84ebcfa8a9.png)
【深入探究】(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bfba12f7f829e7260c2c30413944334.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
【拓展提高】(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a16b7cc6f6f5eb039b1f10e4880f482e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0565bafba84b317d92ac6855ab1c3468.png)
您最近一年使用:0次
名校
9 . 【问题背景】为了保持室内空气的清新,某仓库的门动换气窗采用了以下设计:如图1,窗子的形状是一个五边形,该窗子关闭时可以完全密封,根据室内的温度和湿度也可以自动打开窗子上的通风口换气.通风口为
(阴影部分均不通风),点F为
的中点,
是可以沿窗户边框上下滑动且始终保持和
平行的伸缩横杆.
已知边框
,设
为a
,窗子的高度h(窗子的最高点到边框
的距离)
.
【初步探究】
(1)若
,
.
①
与
之间的距离为
,求此时
的面积.
②
与
之间的距离为x
,试将通风口的面积y
表示成关于x的函数.
③伸缩杆
移动到什么位置时,通风口面积最大,最大面积是多少?
【拓展提升】
(2)若金属杆
移动到高于
所在位置的某一处时通风口面积达到最大值.h需要满足的条件是 ,通风口的最大面积是
(用含a,h的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecfb02e157819a2bdd0f2790cbc825e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
已知边框
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2de0126c416995c7d2c43ca1bd114c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb29186af238a607edbef0c50ee6ce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb29186af238a607edbef0c50ee6ce6.png)
【初步探究】
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae96cd3fcb18e7ba8919bdf4aef510a6.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecfb02e157819a2bdd0f2790cbc825e9.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb29186af238a607edbef0c50ee6ce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd958a14e6e73401f7a95c06166fb0d.png)
③伸缩杆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
【拓展提升】
(2)若金属杆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c901bcdfa58f0c68ad0161b0bab269.png)
您最近一年使用:0次
10 . 通过以前的学习,我们知道:“如图1,在正方形
中,
,则
”.
某数学兴趣小组在完成了以上学习后,决定对该问题进一步探究:
中,点
分别在线段
上,且
,试猜想
_________;
(2)【知识迁移】如图3,在矩形
中,
,点
分别在线段
上,且
,试猜想
的值,并证明你的猜想;
(3)【拓展应用】如图4,在四边形
中,
,点
分别在线段
上,且
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50718815e5b60540035d988ca80c0d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de32b9f279d0cbf3bc8ab9ada1f56111.png)
某数学兴趣小组在完成了以上学习后,决定对该问题进一步探究:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418611b495c71cbdc2f9102bcdc72300.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4ed2e6490abf519cf95cc1c4cb5ed60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d94fef6d03173baf154ac97154571366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7996d44acc430748b604e121fee1cb8e.png)
(2)【知识迁移】如图3,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f7a5ed625693741921fa9148a6b74b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/418611b495c71cbdc2f9102bcdc72300.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4ed2e6490abf519cf95cc1c4cb5ed60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d94fef6d03173baf154ac97154571366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885a273360456694a3d40a913f3df2fc.png)
(3)【拓展应用】如图4,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be012ed58284cbf788365899d13060c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a460f95e8ebabac97d572fecea8fb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c18645bedb8cdf66c41ca9b0bf705f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb6456423140d43ee212a5cc99fa6284.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea624cb140001a7e9d7567903a29521.png)
您最近一年使用:0次
2024-03-17更新
|
137次组卷
|
9卷引用:2023年安徽省合肥市南岗中学中考一模数学试卷