名校
1 . 解答
(1)问题发现:如图1,在
和
中,
,
,点
是线段
上一动点,连接
.填空:
①
的值为______ ;
②
的度数为______ .
(2)类比探究:如图2,在
和
中,
,
,点
是线段
上一动点,连接
.请判断
的值及
的度数,并说明理由;
(3)拓展延伸:如图3,在(2)的条件下,将点
改为直线
上一动点,其余条件不变,取线段
的中点
,连接
、
,若
,则当
是直角三角形时,线段
的长是多少?请直接写出答案.
(1)问题发现:如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2598f844644c4245eb226ecca57ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a356ae65ad2cccdd27189efcea2da0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f4907f159ff9c4caacf266db591588.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685516a27697104e83b311d76efa17aa.png)
(2)类比探究:如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2598f844644c4245eb226ecca57ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17df03e1b7418a84e8f8a3d512b2c1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f4907f159ff9c4caacf266db591588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685516a27697104e83b311d76efa17aa.png)
(3)拓展延伸:如图3,在(2)的条件下,将点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8045b729b7f257861057191a8a2388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
您最近一年使用:0次
2023-05-09更新
|
195次组卷
|
21卷引用:吉林省市命题七十七2019-2020学年九年级上学期期中数学试题
吉林省市命题七十七2019-2020学年九年级上学期期中数学试题2020年河南省中考模拟数学试题(一)(已下线)专题冲刺小卷12 几何综合问题-2020年《三步冲刺中考·数学》之最新模考分类冲刺小卷(河南专用)2020年山东省东营市东营区中考数学6月模拟试题2020年山东省东营市东营区九年级6月学业模拟考试数学试题2020年山东省广饶县初中学业水平模拟考试数学试题河南省周口市太康县2020-2021学年九年级上学期期末数学试题2021年河南郑州外国语中学原创押题卷(B卷) 数学试题(已下线)【万唯原创】2021年河南试题研究-练习册-第四章 三角形5河南省郑州市外国语中学2019-2020学年九年级上学期第二次月考数学试题2022年山东省菏泽市牡丹区中考二模数学试题河南省新乡市卫辉市2021-2022学年九年级上学期期末数学试题福建省三明市永安市2022~2023学年九年级上学期期中考试卷河南省郑州市金水区经纬中学2021-2022学年九年级下学期开学数学试卷(一模) 安徽省亳州市2022--2023学年九年级上学期期末数学试卷山东省东营市东营区文华学校2022-2023学年九年级上学期期末数学试题(已下线)2023年河南省洛阳市偃师市中考数学一模试题变式题21-23题2023年山东省东营市垦利区中考二模数学试题江西省抚州市八校2023-2024学年九年级上学期第一次月考数学试题江苏省宿迁市沭阳县怀文中学、人民路中学2023-2024学年九年级上学期1月期末数学试题2024年山东省泰安市岱岳区中考三模数学试题
2 . 【基础探究】如图1,四边形
中,
,
为对角线,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/899c2ab3-a398-48de-aac6-1112b015d30d.png?resizew=528)
(1)求证:
平分![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4189a0821a0ffab9dc171ecd279ba442.png)
(2)若
,
,则
______.
(3)【应用拓展】如图2.四边形
中,
,
为对角线,
,E为
的中点,连接
、
,
与
交于点F.若
,
,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e8b47fc9201d77d43b805efefe693e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e854e59927399d0e2faae86735cd158e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/899c2ab3-a398-48de-aac6-1112b015d30d.png?resizew=528)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4189a0821a0ffab9dc171ecd279ba442.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4b1fdfa6c28c7b4113ba306547aa4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
(3)【应用拓展】如图2.四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c73de34f477afd633538e1bc9e73b7ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e854e59927399d0e2faae86735cd158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55cd495dbd7296b0092fa3e1ef77477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8832c5450a61500ccbf73d95e16f449.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad75d52164547b022d8c895205a6c84.png)
您最近一年使用:0次
3 . 已知
是
的中线,点
是线段
上一点,过点
作
的平行线,过点
作
的平行线,两平行线交于点
,连结
.
【方法感知】如图①,当点
与点
重合时,易证:
.(不需证明)
【探究应用】如图②,当点
与点
不重合时,求证:四边形
是平行四边形.
【拓展延伸】如图③,记
与
的交点为
,
的延长线与
的交点为
,且
为
的中点.
(1)
______
(2)若
,
时,则
的长为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/1/23f1411a-872e-4efa-8cd7-9433c706f14d.png?resizew=493)
【方法感知】如图①,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04006562d5654e3daa4be3422aa454e.png)
【探究应用】如图②,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
【拓展延伸】如图③,记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a448fe43baa0f38221cd3a2d06b06f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f12cacb8b66100d800356b2ba0b0df6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
您最近一年使用:0次
4 . (1)【问题解决】如图
,点
在线段
上,点
在
同侧,
.求证:
.
![](https://img.xkw.com/dksih/QBM/2022/10/28/3097479392944128/3166273111064576/STEM/25b6313184e44088a647b160d7b0b342.png?resizew=194)
(2)【探究应用】如图
,在
中,
,
,直线
,
与
之间距离是1,
与
之间距离是2,且
、
、
分别经过点
,则边
的长为______.
![](https://img.xkw.com/dksih/QBM/2022/10/28/3097479392944128/3166273111064576/STEM/dc66810d2bc24b7192efe8f406b93b6e.png?resizew=206)
(3)【拓展延伸】如图
,在
中,
,点
是边
的中点,点
分别在边
上,
.若
,
,则
的长为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80934ff67b4ceeaa13b00c029db565dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a48950d6bfb8b93c17636bd07c7165c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7781cc45d7c50c1df9b7ad9baf99f2d.png)
![](https://img.xkw.com/dksih/QBM/2022/10/28/3097479392944128/3166273111064576/STEM/25b6313184e44088a647b160d7b0b342.png?resizew=194)
(2)【探究应用】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af260e0d98c95d1e092dc4c6d348e3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3626f34068e021b882e9fc8354f3be9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a120b008b7be40c9d6f6079bca61652.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2022/10/28/3097479392944128/3166273111064576/STEM/dc66810d2bc24b7192efe8f406b93b6e.png?resizew=206)
(3)【拓展延伸】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ed1fce01430ae31294c29d626626f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4550af14ce0b04bf33f16dd8793ee0dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9279c4c4d4b47190b1375cb310eb8700.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/2022/10/28/3097479392944128/3166273111064576/STEM/d9d4ff41fe454997982fdfd5b6116688.png?resizew=186)
您最近一年使用:0次
5 . 【问题解决】如图①,在
中,点
在边
上(点
不与点
重合),点
在边
上,且
.连结
并延长至点
,使
,连结
.求证:
.
【拓展探究】如图②,在
中,
,点
是边
的中点,点
在边
上,过点
作
交边
于点
,连结
.若
,
,则
的长为__________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de01ca42a21f0cb44b2c914e092a0d85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78f0dc06c224ca63d9267c1a550004d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c5bbd134b3d0c1318b2a43f3a7ef7a.png)
【拓展探究】如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c175c239742c7ba8fd67a6d5f99cb1b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f218914337edd06e59e75d90b777e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4982bdbeb295651557a71800f567444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/c64b7246-d731-45e3-ad19-c4a8a64d36aa.png?resizew=327)
您最近一年使用:0次
解题方法
6 . 【问题发现】(1)如图1,在
中,
,D为
边上一点(不与点B、C重合)将线段
绕点A顺时针旋转90°得到
,连接
,则线段
与
的数量关系是 ,位置关系是 ;
和
中,
将
绕点A旋转,当点C,D,E在同一直线时,
与
具有怎样的位置关系,并说明理由;
【拓展延伸】(3)如图3,在
中,
,将
绕点A顺时针旋转,点C对应点E,设旋转角
为
(
),当点C,D,E在同一直线时,画出图形,并求出线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c513dca3b8c31bc8d0ed4301e94cc1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9171484a68c84cad91e4f2233392f600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c513dca3b8c31bc8d0ed4301e94cc1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbbbb5cd9154733b54fb5e8d3329c90d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a271be7a1d7a3e2af08f5a951e63ffb7.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/a6b41d4070854edfaa24071137b314cb.png)
【拓展延伸】(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5ddc40a683b5ec0d635767f1ab388e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f7f36f5282872616a77ab318992b3d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a783e5ffcf7a4ea9e531ea76199487.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3eb092d5f9440ede1be6e96594ff8d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87dbcc18cbbb34b69913696cadff3198.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
您最近一年使用:0次
2023-02-03更新
|
665次组卷
|
12卷引用:吉林省辽源市东丰县2023-2024学年九年级上学期期末数学试题
吉林省辽源市东丰县2023-2024学年九年级上学期期末数学试题2020年浙江省宁波市余姚市中考数学适应性试卷(已下线)专题27.40 相似三角形几何模型-旋转相似(专项练习)-2021-2022学年九年级数学下册基础知识专项讲练(人教版)2022年山东省淄博市淄川区中考一模数学试题浙江省舟山市普陀区2021-2022学年九年级上学期期末数学试题(已下线)专题4.45 三角形相似与旋转综合专题(培优篇)(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)专题22 手拉手旋转相似模型-【微专题】2022-2023学年九年级数学上册常考点微专题提分精练(北师大版)(已下线)专题27.42 相似三角形与旋转综合专题(培优篇)(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)专题6.43 相似三角形与旋转综合专题(培优篇)(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)第12讲 相似三角形中的“手拉手”旋转型-【多题一解&一题多解】冲刺2023年中考数学满分应对方法与策略(全国通用)(已下线)专题10 相似三角形五种常见模型-【好题汇编】备战2023-2024学年九年级数学上学期期中真题分类汇编(北师大版)(已下线)清单18 相似三角形的10大经典模型-2023-2024学年九年级数学上学期期末考点大串讲(苏科版)
名校
7 . 【问题探究】在学习三角形中线时,我们遇到过这样的问题:如图,在
中,点D为
边上的中点,
,
,求线段
长的取值范围.我们采用的方法是延长线段
到点E,使得
,连结
,可证
,可得
,根据三角形三边关系可求
的范围,我们将这样的方法称为“三角形倍长中线”,则
的范围是:________.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/8b40b5cc-4c5a-447a-b28b-6034a983f209.png?resizew=143)
【拓展应用】
(1)如图,在
中,
,
,
,
,求
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/79ce5198-9a24-4cf8-b2cc-8a68c5cb0485.png?resizew=238)
(2)如图,在
中,D为
边的中点,分别以
为直角边向外作直角三角形,且满足
,连结
,若
,则
________.(直接写出)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b34233772c4c26d6669499d9b1f15a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f685735607fb3ddd0297c4e56dcc5985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa742976289629d0d6f8eaf774c986ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/8b40b5cc-4c5a-447a-b28b-6034a983f209.png?resizew=143)
【拓展应用】
(1)如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a8e2c765175f2a5f4306fd3f3368647.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/519d3cbe962154438e43a23b0d9eda2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/79ce5198-9a24-4cf8-b2cc-8a68c5cb0485.png?resizew=238)
(2)如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ae1210a744ae636419de68a525faf28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18c58da8392d30e47d6dba53861cd1a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4746df85049d1651d3f6c30212a7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a71a9d21f77e9535de152bb33f802bb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/8191eebe-da93-4282-900e-5e48f350cacd.png?resizew=152)
您最近一年使用:0次
2022-11-19更新
|
162次组卷
|
2卷引用:吉林省长春市二道区第五十二中学2022-2023学年九年级上学期10月月考数学试题
8 . 【问题探究】
(1)如图1,△ABC和△DEC均为等腰直角三角形,∠ACB=∠DCE=90°,点B,D,E在同一直线上,连接AD,BD.
①请写出AD与BD之间的位置关系:________;
②若AC=BC=
,DC=CE=
,求线段AD的长;
【拓展延伸】
(2)如图2,△ABC和△DEC均为直角三角形,∠ACB=∠DCE=90°,AC=
,BC=
,CD=
,CE=1.将△DCE绕点C在平面内顺时针旋转,设旋转角∠BCD为α(0°≤α<360°),作直线BD,连接AD,当点B,D,E在同一直线上时,直接写出线段AD的长.
(1)如图1,△ABC和△DEC均为等腰直角三角形,∠ACB=∠DCE=90°,点B,D,E在同一直线上,连接AD,BD.
①请写出AD与BD之间的位置关系:________;
②若AC=BC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
【拓展延伸】
(2)如图2,△ABC和△DEC均为直角三角形,∠ACB=∠DCE=90°,AC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ce0249a3ff99c083fa4421877549db1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619096595112f0340a43b756e114dd3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/b72c3714-b965-46f9-a4e8-2353f6b0e1cd.png?resizew=493)
您最近一年使用:0次
2022-09-18更新
|
158次组卷
|
2卷引用:吉林省吉林市舒兰市2021-2022学年九年级上学期期末数学试题
9 . 【基础探究】
如图1,四边形ABCD中,∠ADC=∠ACB,AC为对角线,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/22/68d827fe-37fc-4da5-8a64-7bba33f04eb9.png?resizew=415)
(1)求证:AC平分∠DAB.
(2)若AC=8,AB=12,则AD= .
【应用拓展】
(3)如图2,四边形ABCD中,∠ADC=∠ACB=90°,AC为对角线,
,E为AB的中点,连结CE、DE,DE与AC交于点F. 若CB=6,CE=5,请直接写出
的值.
如图1,四边形ABCD中,∠ADC=∠ACB,AC为对角线,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75a43d21a366249dfa681d96404e01d6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/22/68d827fe-37fc-4da5-8a64-7bba33f04eb9.png?resizew=415)
(1)求证:AC平分∠DAB.
(2)若AC=8,AB=12,则AD= .
【应用拓展】
(3)如图2,四边形ABCD中,∠ADC=∠ACB=90°,AC为对角线,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e854e59927399d0e2faae86735cd158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad75d52164547b022d8c895205a6c84.png)
您最近一年使用:0次
10 . 在正方形
中,
,点
、
分别是边
、
上的点,连结
,将正方形
沿
翻折,使点
的对称点
落在边
上,点
的对称点为点
,
交边
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/10/0ce3b2db-9a9a-443c-8cd2-2bf1e97dfb52.png?resizew=458)
【探究】如图①,若点
是边
中点,求
的值.
【应用】(1)如图②,若
,则
的值为______.
(2)如图③,若
,则
的值为______.
【拓展】若
,则
的值为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/10/0ce3b2db-9a9a-443c-8cd2-2bf1e97dfb52.png?resizew=458)
【探究】如图①,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e163ba26447f8edfe522252eee1aaf.png)
【应用】(1)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c3eaf4e53058ea12e51c27c71223285.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e163ba26447f8edfe522252eee1aaf.png)
(2)如图③,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d92bef5853399c499bc90286f116ab1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e163ba26447f8edfe522252eee1aaf.png)
【拓展】若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf1bd3fe17457a32f36dc2b0bdef56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e163ba26447f8edfe522252eee1aaf.png)
您最近一年使用:0次