如图1,把
AOB放置在平面直角坐标系中,点O为坐标原点,点A的坐标为(6,6),点B的坐标为(8,0),AH是OB边上的高线,P是线段OB上一动点(点P与点O,H.B均不重合),过A,P,H三点的外接圆分别交AO,AB于点C,D.
(1)求OA的长及tan∠BAH的值;
(2)如图2,连接CD,当CD∥OB时,
①求CD的长;
②求点P的坐标;
(3)当点P在线段OB上运动时,
AD的值是否发生变化?若不变,请求出该定值;若变化,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)求OA的长及tan∠BAH的值;
(2)如图2,连接CD,当CD∥OB时,
①求CD的长;
②求点P的坐标;
(3)当点P在线段OB上运动时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d7e7bd99635f282a4d043bac948dae.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/8ff8aee4-eb48-462a-98e1-b5ad28a11288.png?resizew=512)
2021九年级·安徽·专题练习 查看更多[3]
(已下线)数学-(安徽卷)【试题猜想】2021年中考考前最后一卷(考试版+答题卡+全解全析+参考答案)2021年浙江省宁波市鄞州区五校联考中考数学段考(3月份)试题2022年浙江省宁波市九年级数学中考一轮复习综合模拟试题
更新时间:2021-04-25 15:34:21
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相似题推荐
解答题-作图题
|
困难
(0.15)
【推荐1】在锐角△ABC中,AB=AC,AD为BC边上的高,E为AC中点.
(1)如图1,过点C作CF⊥AB于F点,连接EF.若∠BAD=20°,求∠AFE的度数;
(2)若M为线段BD上的动点(点M与点D不重合),过点C作CN⊥AM于N点,射线EN,AB交于P点.
①依题意将图2补全;
②小宇通过观察、实验,提出猜想:在点M运动的过程中,始终有∠APE=2∠MAD.
小宇把这个猜想与同学们进行讨论,形成了证明该猜想的几种想法:
想法1:连接DE,要证∠APE=2∠MAD,只需证∠PED=2∠MAD.
想法2:设∠MAD=α,∠DAC=β,只需用α,β表示出∠PEC,通过角度计算得∠APE=2α.
想法3:在NE上取点Q,使∠NAQ=2∠MAD,要证∠APE=2∠MAD,只需证△NAQ∽△APQ.……
请你参考上面的想法,帮助小宇证明∠APE =2∠MAD.(一种方法即可)
(1)如图1,过点C作CF⊥AB于F点,连接EF.若∠BAD=20°,求∠AFE的度数;
(2)若M为线段BD上的动点(点M与点D不重合),过点C作CN⊥AM于N点,射线EN,AB交于P点.
①依题意将图2补全;
②小宇通过观察、实验,提出猜想:在点M运动的过程中,始终有∠APE=2∠MAD.
小宇把这个猜想与同学们进行讨论,形成了证明该猜想的几种想法:
想法1:连接DE,要证∠APE=2∠MAD,只需证∠PED=2∠MAD.
想法2:设∠MAD=α,∠DAC=β,只需用α,β表示出∠PEC,通过角度计算得∠APE=2α.
想法3:在NE上取点Q,使∠NAQ=2∠MAD,要证∠APE=2∠MAD,只需证△NAQ∽△APQ.……
请你参考上面的想法,帮助小宇证明∠APE =2∠MAD.(一种方法即可)
![](https://img.xkw.com/dksih/QBM/2017/6/1/1699586303901696/1700352562618368/STEM/1a8ff9ac1b1f4cae834dc4c37620e89d.png?resizew=271)
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名校
【推荐2】已知,
内接于
,AD、BD为
的弦,且
.
(1)如图1,求证:
;
(2)如图2,过B作
的切线交AC的延长线于E,求证:
;
(3)如图3,在(2)的条件下,连接CD,若
,
,
,求CE的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/136b44003ee7e87a38d920e5d3448084.png)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff29971ccc633d89832ffa9bd54afa3.png)
(2)如图2,过B作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0affbda0c3f29889e2c694f1549a27ba.png)
(3)如图3,在(2)的条件下,连接CD,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/981f116d85b7999245de8a10f07509e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a7e75d7342e6f087370d09181b17a4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/620fd368efb51a5ae90c0f3e276704d2.png)
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解答题-证明题
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名校
【推荐1】如图,在平行四边形
中,
于点
.
,
,
,求
的长;
(2)如图2,若
,连接
,过点
作
交
于点
,在
上截取
,连接
,交
于点
,
的角平分线
与
相交于点
,求证:
;
(3)在(2)的条件下,若
,
,请直接写出点
到直线
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/065f2c3527fcc9d84939c47ac8640643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f57b8380e1c9d059087e2bd121153f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ad6f8846d4294ae3789a6ddd17af5b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.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/d0af831d8dd327f64c00f13ecd0e2625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f887360a533f0a25b0b34fb11f0a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f0b8af7ac91d87f4ca8d888dca74260.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af10e790df698bc4cd914ec29ffce7f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1769cd4d629d8ffb00e8511cfda306b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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解答题-证明题
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困难
(0.15)
【推荐2】如图所示,在
中,
,垂足为
,
,
,连接
,
,垂足为
.
![](https://img.xkw.com/dksih/QBM/2020/8/4/2520637135699968/2520772305534976/STEM/da792909-9511-49c5-9e2a-fc057ea8ce0e.png?resizew=279)
(1)求证:
;
(2)如图所示,
,连接
,求
的值;
![](https://img.xkw.com/dksih/QBM/2020/8/4/2520637135699968/2520772305534976/STEM/56eba796-a239-43ec-bdc9-15e9cff1b66d.png?resizew=274)
(3)如图所示,连接
,若
,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1d267eeb09c171c3e847f0597be31c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871fdd28ffa33efdb1b86af898c571a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba870ac7e456d8daa098c9d52aeccc2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/2020/8/4/2520637135699968/2520772305534976/STEM/da792909-9511-49c5-9e2a-fc057ea8ce0e.png?resizew=279)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06f85b901993d986ab6a0eb8a862535c.png)
(2)如图所示,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc2d3df37e73a8abea815f37dbb3fff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180d6f93806a6d4b6c19cf35b48eec0c.png)
![](https://img.xkw.com/dksih/QBM/2020/8/4/2520637135699968/2520772305534976/STEM/56eba796-a239-43ec-bdc9-15e9cff1b66d.png?resizew=274)
(3)如图所示,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f77e777388a304929f9082d21aed718.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40544ad2c1f29fcc69eeac7fa9b8522f.png)
![](https://img.xkw.com/dksih/QBM/2020/8/4/2520637135699968/2520772305534976/STEM/41f7b465-bc73-4182-9e1f-67c9445410cb.png?resizew=264)
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解答题-证明题
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困难
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名校
【推荐1】已知正方形
,
经过点
,
,且与
边相切于点
,连接
.
(1)如图
,求证:
;
(2)如图
,连接
,点
是圆
上一点
平分
,过点
作
交
的延长线于点
.
①求证:
是
的切线;
②若正方形
的边长为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bed45e4d4c844946148c3f12c19fe4a5.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a9c559e3a27d359d5bb51810aa6cf5.png)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d00572a90232e08932317af2a53767.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.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/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c30c86a9f6d0c1f9d316218aa8a7180c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7699dd30e08702bfc6499eb9c89e54a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bed45e4d4c844946148c3f12c19fe4a5.png)
②若正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f12e50c17021e4811dd1aaf34f7eb718.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/3/313628e5-44fb-4fcb-84ff-d935b01916b4.png?resizew=269)
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解答题-问答题
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困难
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【推荐2】如图,在△ABC中,AB=
,∠A=45°,AC=
,过点C作直线平行AB,将△ABC绕点A顺时针旋转得到△
(点B,C的对应点分别为
,
),射线
,
分别交直线
于点P、Q.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/4df8439b-223c-4f43-8576-2719c178b29a.png?resizew=596)
(1)如图1,求BC的长;
(2)如图2,当点C为PQ中点时,求tan∠APQ;
(3)如图3,当点P,Q分别在线段
,
上时,试探究四边形
的面积是否存在最大值.若存在,求出其最大值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92863f6b0a1aaecf38b68b3c9e26f496.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1519efa24b763696ea9d9d02a04c11a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca86d70680cb33c35d61e4960031fceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/4df8439b-223c-4f43-8576-2719c178b29a.png?resizew=596)
(1)如图1,求BC的长;
(2)如图2,当点C为PQ中点时,求tan∠APQ;
(3)如图3,当点P,Q分别在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95684dba66f953101cd59ebe9420267d.png)
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