真题
解题方法
1 . 已知:菱形
和菱形
,
,起始位置点
在边
上,点
在
所在直线上,点
在点
的右侧,点
在点
的右侧,连接
和
,将菱形
以
为旋转中心逆时针旋转
角(
).
(1)如图1,若点
与
重合,且
,求证:
;
![](https://img.xkw.com/dksih/QBM/2020/7/28/2515504718667776/2515737093947392/STEM/c0639394761c4c4a94ee4a86628a67fa.png?resizew=159)
(2)若点
与
不重合,
是
上一点,当
时,连接
和
,
和
所在直线相交于点
;
①如图2,当
时,请猜想线段
和线段
的数量关系及
的度数;
![](https://img.xkw.com/dksih/QBM/2020/7/28/2515504718667776/2515737093947392/STEM/4256cf0dfde04e7eb138a29a611d894b.png?resizew=177)
②如图3,当
时,请求出线段
和线段
的数量关系及
的度数;
![](https://img.xkw.com/dksih/QBM/2020/7/28/2515504718667776/2515737093947392/STEM/00c6bda34fb148a5bf5a2b45d0e177ab.png?resizew=206)
③在②的条件下,若点
与
的中点重合,
,
,在整个旋转过程中,当点
与点
重合时,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/0d609847e2ff3d64e5a514582c3ead0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/788c65ceb0663512e37d68488c8dfc34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.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/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e915c7310f3781887a1afb99dbf949.png)
(1)如图1,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34d2f1f75b87351d44723eedfc34a93a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d493dfab1d8677818b0faddb537e855.png)
![](https://img.xkw.com/dksih/QBM/2020/7/28/2515504718667776/2515737093947392/STEM/c0639394761c4c4a94ee4a86628a67fa.png?resizew=159)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bfea16ad4071629991d3111589d16fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
①如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34d2f1f75b87351d44723eedfc34a93a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0433f8116768b42642a7f7e5977ce6.png)
![](https://img.xkw.com/dksih/QBM/2020/7/28/2515504718667776/2515737093947392/STEM/4256cf0dfde04e7eb138a29a611d894b.png?resizew=177)
②如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cce6f6bf45488ced9895ed73f5e3c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0433f8116768b42642a7f7e5977ce6.png)
![](https://img.xkw.com/dksih/QBM/2020/7/28/2515504718667776/2515737093947392/STEM/00c6bda34fb148a5bf5a2b45d0e177ab.png?resizew=206)
③在②的条件下,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e719b42d66379fcdb027f8006af1918e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
您最近一年使用:0次
解题方法
2 . 已知正方形
,点
在射线
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/5/9c4663ab-5066-48ee-8a3c-893c8b9d0c58.png?resizew=317)
(1)如图1,若点E在线段BD上,F在线段AD上,且
,垂足为H,连接
.
①求证:
;
②求证:
;
(2)如图2,点E在BD的延长线上,以AE为斜边,作
,
,
,若
,直接写出DF的最小值.
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/5/9c4663ab-5066-48ee-8a3c-893c8b9d0c58.png?resizew=317)
(1)如图1,若点E在线段BD上,F在线段AD上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e22ba3e6e1c1d6b12d9b8baa8d1f02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f41e534cb7e42c878895228f57ba92db.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c249a5726b2c8881526f8e1b3137cd.png)
(2)如图2,点E在BD的延长线上,以AE为斜边,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46ecf38432c01f155abf5540e65f28b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a68f71476e365d4c354bd1f6963d1065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2e59617707e98c3441445392333b491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
您最近一年使用:0次
3 . 如图,正方形
的边长为6,
是边
的中点,
是边
上的一个动点,
,且
,则
的最小值为________ .
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5d709c88cb11c9adccc8bf34725a85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b9f4fe60b81ff21ca2acc95848a643d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683f81d1f487d8dd6d965f11fb1bd8fb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/11/832f8f2c-a3c5-4764-9ab2-361608917052.png?resizew=147)
您最近一年使用:0次
2020-07-13更新
|
1009次组卷
|
4卷引用:【万唯原创】2021河南省中考数学模拟试题(二)
(已下线)【万唯原创】2021河南省中考数学模拟试题(二)浙江省宁波市镇海区2019-2020学年八年级下学期期末数学试题(已下线)专题20 正方形中的最值-【微专题】2022-2023学年八年级数学下册常考点微专题提分精练(浙教版)广东省河源市龙川县义都中学2022-2023学年八年级下学期开学考试数学试题
真题
4 . 已知D是Rt△ABC斜边AB的中点,∠ACB=90°,∠ABC=30°,过点D作Rt△DEF使∠DEF=90°,∠DFE=30°,连接CE并延长CE到P,使EP=CE,连接BE,FP,BP,设BC与DE交于M,PB与EF交于N.
(1)如图1,当D,B,F共线时,求证:
①EB=EP;
②∠EFP=30°;
(2)如图2,当D,B,F不共线时,连接BF,求证:∠BFD+∠EFP=30°.
(1)如图1,当D,B,F共线时,求证:
①EB=EP;
②∠EFP=30°;
(2)如图2,当D,B,F不共线时,连接BF,求证:∠BFD+∠EFP=30°.
您最近一年使用:0次
2020-07-10更新
|
2359次组卷
|
7卷引用:湖南省常德市2020年中考数学试题
湖南省常德市2020年中考数学试题(已下线)非选择题专练08 几何综合—2021年《三步冲刺中考·数学》(广东专版)之第2步大题夺高分 (已下线)重难点06 几何类综合问题-2021年中考数学【热点·重点·难点】专练(已下线)专题27 特殊三角形【考点巩固】-【中考高分导航】备战2022年中考数学考点总复习(全国通用)2023年贵州省遵义市第十一中学中考三模数学试题2024年湖南省永州市道县绍基学校中考模拟数学试题(已下线)13.1 轴对称-2022-2023学年八年级数学上册课后培优分级练(人教版)
5 . 如图,正方形
中,点
从点
出发沿
边向点
运动,到达点
停止.作射线
,将
绕着点
逆时针旋转45°,与
边交于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2020/7/4/2498620845268992/2498735034269696/STEM/eb6a137886574e8e84108b17fe985861.png?resizew=115)
(1)画图,完善图形.
(2)三条线段
,
,
之间有无确定的数量关系?请说明理由.
(3)过点
作
于
.若线段
的最大值为4,求点
运动的路径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://img.xkw.com/dksih/QBM/2020/7/4/2498620845268992/2498735034269696/STEM/eb6a137886574e8e84108b17fe985861.png?resizew=115)
(1)画图,完善图形.
(2)三条线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
(3)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/842b354b25e3a7e0288da72f4f28f085.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/2020/7/4/2498620845268992/2498735034269696/STEM/9efd620a612c4823b6bcb019d9fbfe11.png?resizew=123)
您最近一年使用:0次
名校
6 . 已知:
中,
是直径,弦
.
如图1,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d268f81db19ff5c5425ee1fe221caf98.png)
![](https://img.xkw.com/dksih/QBM/2020/5/22/2468437546491904/2470140925935616/STEM/457919465bfc4dac80ce59bdacc5a989.png?resizew=148)
如图2,点
在圆上,连接
,若
,求
的值;
![](https://img.xkw.com/dksih/QBM/2020/5/22/2468437546491904/2470140925935616/STEM/eaeb1a9789ed463cad8ddeb54ca98b60.png?resizew=136)
如图3,在
的条件下,分别延长线段
交于点
,过
作
于
,连接
,若
,求
的长.
![](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/3bdb3995265a321989202ff01001013d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d268f81db19ff5c5425ee1fe221caf98.png)
![](https://img.xkw.com/dksih/QBM/2020/5/22/2468437546491904/2470140925935616/STEM/457919465bfc4dac80ce59bdacc5a989.png?resizew=148)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56903a24a292c8eaa32df4e9f664018a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5df11d572b83b9edf76aadd1dadc6a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d85886e206ef05d51c88d09ad707bc.png)
![](https://img.xkw.com/dksih/QBM/2020/5/22/2468437546491904/2470140925935616/STEM/eaeb1a9789ed463cad8ddeb54ca98b60.png?resizew=136)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62295c36d2e2174908c2bec0eb5b30f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d93949d8a15aca4e79cedb978590571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82d3a004c4f6c29bd52364eb658c704b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96bf46479d445510e5b264bbf1834f33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a477603f3f88c3b48352b6130f9ad5.png)
![](https://img.xkw.com/dksih/QBM/2020/5/22/2468437546491904/2470140925935616/STEM/de755f92ec3642e9ab76d708dc37b694.png?resizew=171)
您最近一年使用:0次
解题方法
7 . 已知:在平面直角坐标系中,抛物线
与
轴交于点
,
(点
在点
的右侧),点
为抛物线的顶点,点
的纵坐标为-2.
(1)如图1,求此抛物线的解析式;
(2)如图2,点
是第一象限抛物线上一点,连接
,过点
作
轴交
于点
,设点
的横坐标为
,
的长为
,求
与
的函数关系式(不要求写出自变量
的取值范围);
(3)如图3,在(2)的条件下,点
在
上,且
,点
的横坐标大于3,连接
,
,
,且
,过点
作
交
于点
,若
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526bb5b206810f46a51d960f58510779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/c5db41a1f31d6baee7c69990811edb9f.png)
(1)如图1,求此抛物线的解析式;
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2047d40034b47507a605dd3ef36bc74a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)如图3,在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4abcd9292846e104dc2234b0aea41a81.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/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33e7ae38fa198effd173ec99c7744804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15876d14ac5debde2bd3f24f33eb8840.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a51407cda1f365c45d69e14365cfe93f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2020/5/11/2460666220765184/2461244047564800/STEM/94f30b1d835446dba575f714984a13a8.png?resizew=427)
您最近一年使用:0次
8 . 已知
内接于圆
,点
为弧
上一点,连接
交
于点
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/5bad598a-4806-472f-b7ab-b9f32f9e6458.png?resizew=642)
(1)如图1,求证:弧
弧
;
(2)如图2,过
作
于点
,交圆
点
,连接
交
于点
,且
,求
的度数;
(3)如图3,在(2)的条件下,圆
上一点
与点
关于
对称,连接
,交
于点
,点
为弧
上一点,
交
于点
,交
的延长线于点
,
,
的周长为20,
,求圆
半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/233c2cf5c75665c6e3eef88d7c558b3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/142ef6b29815c78954c4e50455e8d5a6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/5bad598a-4806-472f-b7ab-b9f32f9e6458.png?resizew=642)
(1)如图1,求证:弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图2,过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2a245381e615882ee5feb7793a1df6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8598f419dffa5b08b0410c388b625a72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781026dac62b5373596f56360bf573a6.png)
(3)如图3,在(2)的条件下,圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/220477a4e9a90fcf6d0f14d2c1c80bfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86c8c89f2e9d75c91411cdaee95a37c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0702bd0b088224b2aedcc925f313d93f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/540b246738c74e87af099782381b62ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
您最近一年使用:0次
2020-05-02更新
|
551次组卷
|
2卷引用:2020年黑龙江省哈尔滨市松雷中学九年级下学期二模数学试题
9 . 问题:如图1,在
中,
,点
是射线
上任意一点,
是等边三角形,且点
在
的内部,连接
.探究线段
与
之间的数量关系.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/80ed1c30-38b5-4b6d-9125-c4245c153d31.png?resizew=176)
请你完成下列探究过程:
先将图形特殊化,得出猜想,再对一般情况进行分析并加以证明.
当点
与点
重合时(如图2),请你补全图形.由
的度数为_______________,点
落在_______________,容易得出
与
之间的数量关系为_______________
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/bb6c5dde-6ea8-4294-a7d4-7996513040cb.png?resizew=185)
当
是
的平分线时,判断
与
之间的数量关系并证明
当点
在如图3的位置时,请你画出图形,研究
三点是否在以
为圆心的同一个圆上,写出你的猜想并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1c16e957064354e113785370f55c84e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/80ed1c30-38b5-4b6d-9125-c4245c153d31.png?resizew=176)
请你完成下列探究过程:
先将图形特殊化,得出猜想,再对一般情况进行分析并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baca09215d12421a58bd6a48ae16c35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/bb6c5dde-6ea8-4294-a7d4-7996513040cb.png?resizew=185)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac0c12379ff58d8ddf66547d7a873baf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a416e351c08669214734418cf60209e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65183d238c9bc2be73770717d890683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/a7a7ffb9-d724-4c0d-9554-c439d53a4529.png?resizew=194)
您最近一年使用:0次
2020-04-20更新
|
616次组卷
|
2卷引用:北京海淀实验中学2019-2020学年九年级下学期适应练习数学试题
10 . 数学课上,老师出示了如下框中的题目:
![](https://img.xkw.com/dksih/QBM/2020/4/7/2436454703595520/2437031395295232/STEM/f3d05ade-f75f-4bff-9ed8-c6a4ecb09cb2.png)
小敏与同桌小聪讨论后,进行了如下解答:
(1)特殊情况,探索结论
当点E为AB的中点时,如图1,确定线段AE与DB的大小关系.请你直接写出结论:AE_______DB(填“>”,“<”或“=”).
![](https://img.xkw.com/dksih/QBM/2020/4/7/2436454703595520/2437031395295232/STEM/e9685458-f983-476f-acf9-f4742c081de2.png)
(2)特例启发,解答题目
解:题目中,AE与DB的大小关系是:AE DB(填“>”,“<”或“=”)理由如下:如图2,过点E作EF∥BC,交AC于点F,(请你接着继续完成以下解答过程)
(3)拓展结论,设计新题
在等边三角形ABC中,点E在直线上AB上,点D在直线BC上,且ED=EC.若△ABC的边长为3,AE=5,求CD的长(请你直接写出结果).
![](https://img.xkw.com/dksih/QBM/2020/4/7/2436454703595520/2437031395295232/STEM/f3d05ade-f75f-4bff-9ed8-c6a4ecb09cb2.png)
小敏与同桌小聪讨论后,进行了如下解答:
(1)特殊情况,探索结论
当点E为AB的中点时,如图1,确定线段AE与DB的大小关系.请你直接写出结论:AE_______DB(填“>”,“<”或“=”).
![](https://img.xkw.com/dksih/QBM/2020/4/7/2436454703595520/2437031395295232/STEM/e9685458-f983-476f-acf9-f4742c081de2.png)
(2)特例启发,解答题目
解:题目中,AE与DB的大小关系是:AE DB(填“>”,“<”或“=”)理由如下:如图2,过点E作EF∥BC,交AC于点F,(请你接着继续完成以下解答过程)
(3)拓展结论,设计新题
在等边三角形ABC中,点E在直线上AB上,点D在直线BC上,且ED=EC.若△ABC的边长为3,AE=5,求CD的长(请你直接写出结果).
您最近一年使用:0次
2020-04-08更新
|
856次组卷
|
5卷引用:2020年江苏省扬州市宝应县中考数学一模试题
2020年江苏省扬州市宝应县中考数学一模试题河南省沈丘县槐店回族镇2020-2021学年八年级上学期期中数学试题湖南省岳阳市临湘市2022-2023学年八年级上学期期中质量检测数学试题(已下线)期中真题精选(压轴60题专练)-2022-2023学年八年级数学下学期期中期末考点大串讲(北师大版)浙江省台州市临海市东塍镇中学2023-2024学年八年级上学期期中数学试题