1 . 如图,已知
为
的直径,点
、
在
上,
,
、
是线段
、
的延长线上的点,并且
与
相切于点D.
![](https://img.xkw.com/dksih/QBM/2020/12/9/2611265054556160/2621698892931072/STEM/4b17cec5f1874c3b83c89d2112b25978.png?resizew=216)
(1)求证:
;
(2)若
,
,求
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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b7513e09cccf40c3a483064b97e48.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/2020/12/9/2611265054556160/2621698892931072/STEM/4b17cec5f1874c3b83c89d2112b25978.png?resizew=216)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae5a00e4cfa353faf4d02c13af3b3808.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
您最近一年使用:0次
2 . 如图,
的对角线
,
相交于点O,且
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/12/9/2617043781959680/2621276023365632/STEM/ee7a0951-e4ce-4583-a180-a4f564070f94.png?resizew=183)
(1)求证:四边形
是菱形
(2)若
,
,求
的长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.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/6a78e006003b83147e901b34688a7f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7acc0628dabbbaa929b7437021cad8a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cede2006bf19da5ae1c126da517ce79c.png)
![](https://img.xkw.com/dksih/QBM/2020/12/9/2617043781959680/2621276023365632/STEM/ee7a0951-e4ce-4583-a180-a4f564070f94.png?resizew=183)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cbfaec1d9dcaaf159b060163436113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
名校
3 . 如图,在
中,
,
为
边上的高线,
为
上一点,满足
,连接
.
![](https://img.xkw.com/dksih/QBM/2020/12/9/2612516222394368/2621212060819456/STEM/3e2da0bb-211d-4ba4-9325-c0a6db7f08df.png?resizew=261)
(1)求证:
;
(2)取线段
的中点M,连接并延长
到点F,使得
.
①依题意补全图形;
②求证:
;
③连接
,若
成立,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3620030e8808da46df97330103827913.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/2020/12/9/2612516222394368/2621212060819456/STEM/3e2da0bb-211d-4ba4-9325-c0a6db7f08df.png?resizew=261)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7595bdaea3dfa548c0fcfe3708387476.png)
(2)取线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533963a9196536928d7e4d43caef51c8.png)
①依题意补全图形;
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/459758a36144590a77a7183e3be2d5a5.png)
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1fbba1c784be16e242427c5b2abde88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c2abe5da7ee1a2ff3ca5dec7a2d04dc.png)
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解题方法
4 . 定义:有且仅有一组对角相等的凸四边形叫做“准平行四边形”.例如:凸四边形
中,若
,
,则称四边形
为准平行四边形.
(1)如(图①),
、
、
、
是⊙O上的四个点,
,延长
到
,使
.求证:四边形
是准平行四边形;
(2)如(图②),准平行四边形
内接于⊙O,
,
,若⊙O的半径为5,
,求
的长;
(3)如(图③),在
中,
,
,
,若四边形
是准平行四边形,且
,请直接写出
长的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1393308bc68322f50fa29702dd412263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520d831f0b99a1698f06775cc2047390.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/19/d5772f9f-aed7-44d3-80fd-1dc49570c3cc.png?resizew=381)
(1)如(图①),
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/991fdca41f19de62f60e293c3756aee0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/045b85674bbe01e477c76501affed905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ba22b69231ffb2878458c15c51bd90.png)
(2)如(图②),准平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c06e36ec59fa93ac857e35796a4b8311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4009aa13093cc3865dcd51b371892160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)如(图③),在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5755afc235f06b6a6c8624aaa0a6aa5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
2020-12-24更新
|
535次组卷
|
7卷引用:江苏省扬州市仪征市2019-2020学年九年级上学期期末数学试题
江苏省扬州市仪征市2019-2020学年九年级上学期期末数学试题江苏省南通市如东县2019-2020学年九年级上学期期中数学试题(已下线)专题18创新型与新定义综合问题-决胜2020年中考数学压轴题全揭秘精品(2)湖南省长沙市周南教育集团2020-2021学年九年级上学期12月联考数学试题湖南长沙周南集团2019-2020学年九年级下学期第三次联考数学试题(已下线)必刷卷02-2021年中考数学考前信息必刷卷(湖南长沙专用)江苏省扬州市江都区八校联谊2022-2023学年九年级数学上学期期中试题
5 . 下表所示的是小安填写的数学实践活动报告的部分内容.
已知四边形
为矩形,
于点G,且点A,B,C,D,E,F,G都在同一竖直平面内,求铁塔
的高度.(结果精确到1米;参考数据:
)
题目 | 测量铁塔顶端到地面的高度 | |
测量目标示意图 | ||
相关数据 |
|
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce50eeb654ef50f36a582c785f273ecf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57c0924cc4f92785c425706d79f28cfd.png)
您最近一年使用:0次
解题方法
6 . 如图,在矩形ABCD中,
=
,F、G分别为边AB、DC上的动点,连接GF,将四边形AFGD沿GP折叠,使点A落在边BC上的点E处,得到四边形EFGP,EP交CD于点 H,连接AE交GF于点O.
(1)GF与AE之间的位置关系是 .
(2)求
的值.
(3)连接CP,若tan∠CGP=
,GF=2
,请直接写出CP的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/775c0ddaeb41dc57fa945aa7078cb5af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)GF与AE之间的位置关系是 .
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af599221c4d97913167f86fd2bcf4bd.png)
(3)连接CP,若tan∠CGP=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
![](https://img.xkw.com/dksih/QBM/2020/12/21/2619136719249408/2620442391601152/STEM/93b82882e32d4b289f759dca62d2891a.png?resizew=118)
您最近一年使用:0次
2020-12-23更新
|
127次组卷
|
2卷引用:山西省2020-2021学年九年级第三次大联考数学华师大版试题
7 . 我们把方程
称为圆心为
、半径长为r的圆的标准方程.例如,圆心为
、半径长为3的圆的标准方程是
.在平面直角坐标系中,
与x轴交于点A,B,且点B的坐标为
,与y轴相切于点
,过点A,B,D的抛物线的顶点为E.
![](https://img.xkw.com/dksih/QBM/2020/12/18/2616913559289856/2618993160200192/STEM/5012b9c6300c47f185480ef9102ee79b.png?resizew=531)
(1)求
的标准方程;
(2)求抛物线的解析式;
(3)试判断直线
与
的位置关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2d07bb439c05a85ff6804f5036c6505.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a64d924836b4292239d9726c6473d7f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca280ccbf4426a4e3837e03ac8791d9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a4e5961247ad66d441e745b1aa1da54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af355c8984f67e4ceceaf9df0a42e5d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7bbb2a23bb28d443062ae3e1a30b1be.png)
![](https://img.xkw.com/dksih/QBM/2020/12/18/2616913559289856/2618993160200192/STEM/5012b9c6300c47f185480ef9102ee79b.png?resizew=531)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
(2)求抛物线的解析式;
(3)试判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
您最近一年使用:0次
8 . 如图,C为线段BD上一动点,分别过点B,D作AB⊥BD,DE⊥BD,连结AC,CE.
(1)已知AB=3,DE=2,BD=12,设CD=x.用含x的代数式表示AC+CE的长;
(2)请问点C满足什么条件时,AC+CE的值最小?并求出它的最小值;
(3)根据(2)中的规律和结论,请构图求出代数式
的最小值.
(1)已知AB=3,DE=2,BD=12,设CD=x.用含x的代数式表示AC+CE的长;
(2)请问点C满足什么条件时,AC+CE的值最小?并求出它的最小值;
(3)根据(2)中的规律和结论,请构图求出代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4073c77424958c46fa4216e28db185a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/c69f7d08-02e0-4a28-9e4f-f3ae6d482c68.png?resizew=154)
您最近一年使用:0次
2020-12-21更新
|
325次组卷
|
3卷引用:浙江省杭州市萧山区城北片区2020-2021学年八年级上学期期中数学试题
9 . 如图,AB是⊙O的直径,C是⊙O上一点,AD和过点C的一切线互相垂直,垂足为D.
(1)求证:AC平分∠DAB;
(2)若DC=4,DE=2,求AB的长.
(1)求证:AC平分∠DAB;
(2)若DC=4,DE=2,求AB的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/25/1b81459a-3da3-4861-ace0-cf328946d62b.png?resizew=135)
您最近一年使用:0次
2020-12-20更新
|
285次组卷
|
2卷引用:江苏省南通市海门区东洲国际学校2020-2021学年九年级上学期月考数学试题
10 . 有两棵树,一棵高9米,另一棵高4米,两树相距12米. 一只小鸟从一棵树的树梢(最高点)飞到另一棵树的树梢(最高点),问小鸟至少飞行多少米?
您最近一年使用:0次
2020-12-20更新
|
113次组卷
|
2卷引用:甘肃省张掖市高台县南华初级中学2019-2020学年八年级上学期期末数学试题