如图,D为⊙O上一点,点C在直径BA的延长线上,∠CDA=∠CBD.
(1)求证:CD是⊙O的切线;
(2)过点B作⊙O的切线交CD的延长线于点E,若BC=4,tan∠ABD=
,求BE的长.
(1)求证:CD是⊙O的切线;
(2)过点B作⊙O的切线交CD的延长线于点E,若BC=4,tan∠ABD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2020/2/24/2405723814928384/2406026367229952/STEM/035fc1a4230948dbb6c167d89fe3eb9d.png?resizew=169)
更新时间:2020-02-24 18:16:05
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相似题推荐
解答题-证明题
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【推荐1】如图,点C在
的直径
上方的圆弧上运动(不与点A,B重合),射线
交
于点E,
,
交
于点P,
平分
.
(1)求证:
是
的切线;
(2)若
,
,求直径
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/12/37bc17f9-a701-4e61-87cb-1ef45560d467.png?resizew=185)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86338536656046e93b53672ade9a78b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc24f9e81341f684b830d22f8f15310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
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名校
【推荐2】如图,
是圆O的切线,切点为A,
是圆O的直径,连接
交圆O于E.过A点作
于点D,交圆O于B,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/7c10a506-4381-498c-89f3-1985b147a1a4.png?resizew=212)
(1)求证:
;
(2)求证:
是圆O的切线;
(3)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74d4d587b12f0c7714838330b2b84ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/123dddb998fc1b245f9c4b173f9602cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/7c10a506-4381-498c-89f3-1985b147a1a4.png?resizew=212)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2793ae4839e22b95d72d5af5268665b.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11357ba36d2a650d0df73ae98749e983.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
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真题
【推荐1】如图,
是
的外接圆,点
在
边上,
的平分线交
于点
,连接
,
,过点
作
的切线与
的延长线交于点
.
(1)求证:
;
(2)求证:
;
(3)当
,
时,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da023db3abae0fbef3699475a96939bd.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec10011475d1dc7896e8c5f6242571ee.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6850a299395c314b8f8f2f8ca50c9895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e78e09d194bf11cc12858fd22d58b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
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【推荐2】如图,在
中,
,
于点
,
,
.点
从点
出发,在线段
上以每秒
的速度向点
匀速运动;与此同时,垂直于
的直线
从底边
出发,以每秒
的速度沿
方向匀速平移,分别交
、
、
于点
、
、
,当点
到达点
时,点
与直线
同时停止运动,设运动时间为
秒(
).
(1)当
时,连接
、
,求证:四边形
为菱形;
(2)当
时,求
的面积;
(3)是否存在某一时刻
,使
为以点
或
为直角顶点的直角三角形?若存在,请求出此时刻
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72e015a5ee2b29e52a32823bced2bdfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b7e65f851b876b5947b8b521ad7d4f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f319d8ffd15a6ce36ca7aecad4fd087.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/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2713679aa5f12e1d89d3a3d98b65212e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.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/03902478df1a55bc99703210bccab910.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/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/0fff6e7e2b9f2b68b1647f6350b98dc8.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cbeede118c407a800b05757b9a1393e.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/48a61d8bedef61745ee4fd89a8c0c119.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66884efff7400f92b530d69d029778d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1c4ed7451103f0cbf14bb9ae219b43.png)
(3)是否存在某一时刻
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1c4ed7451103f0cbf14bb9ae219b43.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/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/2019/7/29/2257206785744896/2257266730098688/STEM/41128a3f428d4e7dba03b8d8c436e8b7.png?resizew=269)
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【推荐3】在学习了矩形这节内容之后,明明同学发现生活中的很多矩形都很特殊,如我们的课本封面、A4 的打印纸等,这些矩形的长与宽之比都为
:1,我们将具有这类特征的矩形称为“完美矩形”如图(1),在“完美矩形”ABCD 中,点 P 为 AB 边上的定点,且 AP=AD.
(1)求证:PD=AB.
(2)如图(2),若在“完美矩形“ABCD 的边 BC 上有一动点 E,当
的值是多少时,△PDE 的周长最小?
(3)如图(3),点 Q 是边 AB 上的定点,且 BQ=BC.已知 AD=1,在(2)的条件下连接 DE 并延长交 AB 的延长线于点 F,连接 CF,G 为 CF 的中点,M、N 分别为线段 QF 和 CD 上的动点,且始终保持 QM=CN,MN 与 DF 相交于点 H,请问 GH 的长度是定值吗?若是,请求出它的值,若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(1)求证:PD=AB.
(2)如图(2),若在“完美矩形“ABCD 的边 BC 上有一动点 E,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68f1e72cbc30ad5fca807664692ea30b.png)
(3)如图(3),点 Q 是边 AB 上的定点,且 BQ=BC.已知 AD=1,在(2)的条件下连接 DE 并延长交 AB 的延长线于点 F,连接 CF,G 为 CF 的中点,M、N 分别为线段 QF 和 CD 上的动点,且始终保持 QM=CN,MN 与 DF 相交于点 H,请问 GH 的长度是定值吗?若是,请求出它的值,若不是,请说明理由.
![](https://img.xkw.com/dksih/QBM/2018/12/30/2108039927791616/2110959477022720/STEM/f1af179b2d5a43fdb336aea87d1b944f.png?resizew=438)
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【推荐1】如图,正方形ABCD中,对角线AC、BD交于点O,将BD绕点B逆时针旋转30°到BE所在的位置,BE与AD交于点F,分别连接DE、CE.
![](https://img.xkw.com/dksih/QBM/2017/4/21/1670552214528000/1671960470118400/STEM/c611f9bedf7848089af459e30f6860e6.png?resizew=100)
(1)求证:DE=DF;
(2)求证:
;
(3)求tan∠ACE的值.
![](https://img.xkw.com/dksih/QBM/2017/4/21/1670552214528000/1671960470118400/STEM/c611f9bedf7848089af459e30f6860e6.png?resizew=100)
(1)求证:DE=DF;
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/684d328b02462aa25a936d1c83eee4fb.png)
(3)求tan∠ACE的值.
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【推荐2】如图,
内接于
,连接
,
.记
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966644334100480/2969431133814784/STEM/72b8efd5858e44538eb8b6f8eb579b57.png?resizew=135)
(1)探究
与
之间的数量关系,并证明.
(2)设
与
交于点
,
半径为1,
①若
,
,求由线段
,
,弧
围成的图形面积
.
②若
,设
,用含
的代数式表示线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5678ac1a2b836530db042fc208b2f394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2cf0e95fdf1fd8a5b01d3dfd905e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76107f9e171e4df241e11e8e20733a0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c1180648f6fdc2e77160126b07ecc0.png)
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966644334100480/2969431133814784/STEM/72b8efd5858e44538eb8b6f8eb579b57.png?resizew=135)
(1)探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.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/3d97cdc586744d208b6f69c9813af977.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e316d86cae0e7686e4b06c617b4f6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20b4743ae3afbd9192b22732881a91d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b21d1a34cd8794110c5c52965a0194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c575db7db69076aca283debf391182c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
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