1 . (1)已知
为等边三角形,点
是线段
上的动点,连接
.
①如图
,
,
,连接
,延长
交
于点E.则
和
的数量关系是______,
和
所夹的钝角
______
;
②如图
,点
是
上任意一点,点
在点
的左侧,作
,
,连接
,当点
运动到
的中点时,求
的值和
的度数;
(2)如图
,已知
为等腰直角三角形,
,
,点
,
分别是线段
,
的中点,连接
,点
是线段
上任意一点,点
在点
的左侧,作
,
,连接
,
,当
取最小值时,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a19e150935c7682911a5e5e797772735.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8c1b6c5878d4c2cdbeddb0323c02eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0a8cfb3747c454e0698e12857ffae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0a8cfb3747c454e0698e12857ffae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0a8cfb3747c454e0698e12857ffae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9af21c536aaa61059fdd293afbe208e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
②如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/264d4a72ffe6b8720d533b596748fd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3181e58f09e9fec4e43e422b82831b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.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/8a01eb6e8cc6df4c4d449425ee0429d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a4912527ea5accc9e810fca02f0b8cb.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b922c7fc50a56933a6cb9d80b1e7bb6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/264d4a72ffe6b8720d533b596748fd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39cb59543ccf42b37ebce3f67416e561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/e6989d95-aadc-43b2-bd3e-8e4d1889006b.png?resizew=474)
您最近一年使用:0次
名校
2 . 在
中,
,
,
,
,
分别为射线
与射线
上的两动点,且
,连接
,
,则
最小值为______ ;
的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598ddbb5b7c8efa0c9e69210a9861cd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eac6f98ed81727dc5f6699ea5117fff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d24de889b36de076a95076a05f21fa5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc1280796dd2ec9697af82c7786a5ca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/3df1e8da-c5d3-4bab-b3a9-8d48ac0d8857.png?resizew=191)
您最近一年使用:0次
2024-02-22更新
|
123次组卷
|
3卷引用:特色题型专练05 最值问题-三角形-备战2024年中考数学考试易错题(江苏专用)
(已下线)特色题型专练05 最值问题-三角形-备战2024年中考数学考试易错题(江苏专用)四川省成都市成都七中育才学校金堂分校2023-2024学年八年级上学期期末数学试题四川省成都市锦江区成都市七中育才学校2023-2024学年八年级上学期期末数学试题
3 . 如图,将长
、宽
的矩形纸片
折叠,使点
与
重合,则折痕
的长为_________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d19daa2b38e3a52bd7096d235c843110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b1fe1b971b780e443a9b13621611c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
您最近一年使用:0次
2024-02-21更新
|
131次组卷
|
2卷引用:2024年内蒙古呼伦贝尔市阿荣旗九年级下学期中考二模数学试题
名校
4 . 如图①,点在线段
上
点
不与
,
重合
,分别以
,
为边在
同侧作等边三角形
和等边三角形
,连接
,
交于点
.
(1)观察猜想:
①与
的数量关系为 .
②的度数为 ;
(2)数学思考:
如图②,当点在线段
外时,
中的结论①,②是否仍然成立?若成立,请给予证明;若不成立,请你写出正确结论再给予证明.
(3)拓展应用:
如图③,点为四边形
内一点,且满足
,
,
对角线
,
交于点
,
,则四边形
的面积为 .
您最近一年使用:0次
2024-02-21更新
|
134次组卷
|
16卷引用:2024年吉林省四平市第三中学校中考模拟预测数学模拟预测试题
2024年吉林省四平市第三中学校中考模拟预测数学模拟预测试题2019年吉林省长春市中考零模数学试题吉林大学附属中学2019-2020学年九年级下学期疫情期间网课质量检测数学试题2021年吉林省松原市乾安县初中毕业生学业水平模拟考试数学试题2022年吉林省吉林市大学区中考第五次联考数学试题(A卷)(一模)吉林省松原市四校联考2022-2023学年九年级上学期期中数学试题吉林省松原市前郭尔罗斯蒙古族自治县前郭县白依拉嘎乡中学等3校2022-2023学年九年级上学期期中数学试题广东省中山市华侨中学2023-2024学年九年级上学期期中数学试题河南省信阳市罗山县2023-2024学年八年级上学期期末数学试题【市级联考】河南省洛阳市2018-2019学年八年级(上)期末数学试卷江西省宜春市丰城市2019-2020学年八年级上学期期末数学试题河南省洛阳市第二外国语学校2021-2022学年八年级上学期开学考试数学试题山西省晋中市介休市第三中学校2020-2021学年八年级下学期第一次月考试题数学试题(已下线)专题12 共定点等边三角形的六大结论及应用-【微专题】2022-2023学年八年级数学上册常考点微专题提分精练(苏科版)四川省广元市苍溪县东溪、元坝、歧坪、五龙、陵江片区2022-2023学年八年级上学期期中联考数学试题江西省赣州市章贡区第三中学2022-2023年八年级数学上学期期末质量检测试题
5 . (1)如图1,在正方形中,点F,G分别在边
,
上,若
,则
,
,
之间的数量关系为:_______;(提示:以点D为旋转中心,将
顺时针旋转
)
解决问题:
(2)如图2,若把(1)中的正方形改为等腰直角三角形,,E,F是底边
上任意两点,且满足
,试探究
,
,
之间的关系;
拓展应用:
(3)如图3,若把(1)中的正方形改为菱形,
,菱形的边长为8,G,F分别为边
,
上任意两点,且满足
,请直接写出四边形
的面积.
您最近一年使用:0次
2024-02-21更新
|
78次组卷
|
3卷引用:江西省九江市都昌县2023-2024学年九年级上学期期末数学试题
6 . 石碾,是一种用石头和木材等制作的破碎或去皮工具,由碾盘、碾砣、碾框、碾管芯、碾棍孔、碾棍等组成石碾分上下两部分,上面的叫碾砣,下面的叫碾盘,碾砣被固定在碾框上(碾齿深的那头在中间)而碾框是用硬木(一般是枣木)做成的架子,如图,为石碾抽象出来的模型,
是
的直径,AC为
的切线,点D是
上的一点,连接
并延长
与
的延长线交于点E,连接
,已知
.
是
的切线;
(2)若
,
,求
的半径的长.
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9118e66a11459dd8e835afac0185ab48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/562471558e5ed348985e87bb7009f6a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
您最近一年使用:0次
2024-02-21更新
|
121次组卷
|
3卷引用:江苏省宿迁市崇文初级中学2023-2024学年九年级上学期期末数学试题
名校
7 . 石碾,是一种用石头和木材等制作的破碎或去皮工具,如图,为石碾抽象出来的模型,
是
的直径,
为
的切线,点D是
上的一点,连接
并延长
与
的延长线交于点E,连接
,已知
.
(1)求证:
是
的切线;
(2)若
,
,求
的半径长.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8e804b2efd27e84a095e977050d9d8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/17/28bd872d-0152-48ff-92c0-654ecc64ac4e.png?resizew=363)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/562471558e5ed348985e87bb7009f6a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
您最近一年使用:0次
8 . 如图,正方形
中,边长为4,
为
的中点,
为正方形内部一点,连结
、
,若
平分
且
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/71755ecf-0c8b-45a8-beca-d3ba9f7825b3.png?resizew=123)
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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/a7316430d26a6f4bcc0bdadfd1a5330a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3cd8fbcd9eb594adb8367795d444d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/71755ecf-0c8b-45a8-beca-d3ba9f7825b3.png?resizew=123)
A.![]() | B.![]() | C.![]() | D.2 |
您最近一年使用:0次
9 . 已知:如图,
,
相交于点O.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f22970342e5d2011554a04fe44ef96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692c58a2af64d705cd4a988ed2bfbc3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870db8090d5c4d194c25cf1355968f29.png)
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10 . 已知,如图,D是
边
上的一点,E是
的中点,F在线段
的延长线上,且
.求证:
,
.
![](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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9a9618018d717926540d1452f76e44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac52d97c07b4c2d57f09edccdecce6a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ee8395bbad7eb776f328d816b5abbb7.png)
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