如图,CD是⊙O的直径,点B在⊙O上,连接BC、BD,直线AB与CD的延长线相交于点A,AB2=AD•AC,OE∥BD交直线AB于点E,OE与BC相交于点F.
(1)求证:直线AE是⊙O的切线;
(2)若⊙O的半径为3,cosA=
,求OF的长.
(1)求证:直线AE是⊙O的切线;
(2)若⊙O的半径为3,cosA=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
![](https://img.xkw.com/dksih/QBM/2020/2/29/2409307302715392/2409964837191680/STEM/daae8290e14b49288b6882d773636396.png?resizew=151)
更新时间:2020-03-01 07:48:55
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真题
【推荐1】如图,四边形
内接于
,
为
的直径,过点D作
,交
的延长线于点F,交
的延长线于点E,连接
.若
.
为
的切线.
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d276d0010fd458383ea3dd61415e1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e324b08fed257dcf9a201586fd12f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b61601ecf8de47ed9b84ee59d65f8118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/155b6084b8d24e54d7d9fc611878b070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】如图,在△ABC中,点D是AC边上一点,以AD为直径的⊙O与边BC切于点E,且AB=BE.
(1)求证:AB是⊙O的切线;
(2)若BE=3,BC=7,求⊙O的半径长;
(3)求证:
=CD•CA.
(1)求证:AB是⊙O的切线;
(2)若BE=3,BC=7,求⊙O的半径长;
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd9cc12cf9b82430066130c5edb32eda.png)
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【推荐1】如图1,在菱形ABCD中,AC是对角线,AB=AC=6,点E、F分别是边AB、BC上的动点,且满足AE=BF,连接AF与CE相交于点G.
(1)求
的度数.
(2)如图2,作
交CE于点H,若CF=4,
,求GH的值.
(3)如图3,点O为线段CE中点,将线段EO绕点E顺时针旋转60°得到线段EM,当
构成等腰三角形时,请直接写出AE的长.
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f824371a146ba1db2bf20b6f0dacc139.png)
(2)如图2,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83a0babb8eb2c57227dd15cb19559f74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7868640465318fc66ed9a5fc3c87463b.png)
(3)如图3,点O为线段CE中点,将线段EO绕点E顺时针旋转60°得到线段EM,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d07c8bbe998131ec2927950c33b88d8.png)
![](https://img.xkw.com/dksih/QBM/2021/11/10/2848313490112512/2853815674757120/STEM/28427227-5aaa-4a54-bc76-e4f638da3524.png)
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【推荐2】如图,在
中,
,动点P从点C出发,以
的速度沿边
向终点A匀速运动,当点P与点A,C不重合时,过点P作
交边
于点Q,作点C关于直线
的对称点D,连接
,设点P的运动时间为
,四边形
与
重叠部分图形的面积为
.
(1)
的长为
(用含x的代数式表示);
(2)当点D落在边
上时,求x的值;
(3)求y关于x的函数关系式,并写出自变量x的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f671e825104bd3a615f706c25703b4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ba95116dc790b935d65bf540799cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259a6725a9231c13ee8775d84ea397ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a498d68428824fbb4b8b7bc0e4f3e63a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e391bf9721d27614a97bf957a94f43e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3153eaf33c6598186a2ef6b10e031d91.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/9ff4cc53-b274-4f16-be48-ca0f32a132fa.png?resizew=298)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(2)当点D落在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)求y关于x的函数关系式,并写出自变量x的取值范围.
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【推荐1】如图,梯形
中,
在
轴上,
∥
,∠
=
°,
为坐标原点,
,
,动点
从点
出发,以每秒1个单位的速度沿线段
运动,到点
停止,过点
作
⊥
轴交
或
于点
,以
为一边向右作正方形
,设运动时间为
(秒),正方形
与梯形
重叠面积为
(平方单位).
![](https://img.xkw.com/dksih/QBM/2015/8/14/1573897078857728/1573897085427712/STEM/86da53efeea6407981b75c477be2303a.png)
(1)求tan∠AOC.
(2)求
与t的函数关系式.
(3)求(2)中的
的最大值.
(4)连接
,
的中点为
,请直接写出在正方形
变化过程中,t为何值时,△
为等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134c3d2c318a33a82da4134dd17fa57e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134c3d2c318a33a82da4134dd17fa57e.png)
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(1)求tan∠AOC.
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(3)求(2)中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(4)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134c3d2c318a33a82da4134dd17fa57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06d8243e6b8681d9942e823e091a0c33.png)
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【推荐2】如下图,抛物线
与
轴正半轴交于点
,过点
作直线
轴,点
是抛物线在第一象限部分上的一动点,连接
并延长交直线
于点
,连接
并延长交
轴于点
,过点
作
轴,垂足为
,连接
.设
.
![](https://img.xkw.com/dksih/QBM/2020/10/7/2566068063682560/2566808240832512/STEM/7ccbf29187334047a5ac611e30d43ffe.png?resizew=461)
(1)请直接写出
点坐标并求出
的最大值;
(2)如图1,随着点
的运动,
的值是否会发生变化?若变化,请说明理由,若不变,则求出它的值;
(3)连接
,如图2,则当点
位于何处时,点
到直线
的距离最大?请你求出此时点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20fb7fa4bfd4dabf2d07d8c12331c7a1.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/5963abe8f421bd99a2aaa94831a951e9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/59fbd9b5e5d8be69373850d7faebdaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/805da1a36463a1405d625063d9e99aa7.png)
![](https://img.xkw.com/dksih/QBM/2020/10/7/2566068063682560/2566808240832512/STEM/7ccbf29187334047a5ac611e30d43ffe.png?resizew=461)
(1)请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae959d75878c45e5316b7e085da56aeb.png)
(2)如图1,随着点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5f4c79e53ca6909dec322841cb39558.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/dad2a36927223bd70f426ba06aea4b45.png)
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