如图,已知AB是⊙O的直径,P是BA延长线上一点,PC切⊙O于点C,CD⊥AB,垂足为D.
![](https://img.xkw.com/dksih/QBM/2019/5/31/2215419858845696/2217159574331392/STEM/2fd2eb0ab99c48ebb6bcc0490a460e1c.png?resizew=185)
(1)求证:∠PCA=∠ABC;
(2)过点A作AE∥PC交⊙O于点E,交CD于点F,交BC于点M,若∠CAB=2∠B,CF=
,求阴影部分的面积.
![](https://img.xkw.com/dksih/QBM/2019/5/31/2215419858845696/2217159574331392/STEM/2fd2eb0ab99c48ebb6bcc0490a460e1c.png?resizew=185)
(1)求证:∠PCA=∠ABC;
(2)过点A作AE∥PC交⊙O于点E,交CD于点F,交BC于点M,若∠CAB=2∠B,CF=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
更新时间:2019-05-23 08:45:38
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【知识点】 切线的应用
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】如图,二次函数y=
x2﹣6
x+5
的图象交x轴于A、B两点,交y轴于点C,连接BC.
![](https://img.xkw.com/dksih/QBM/2018/9/28/2042186072752128/2045744426123264/STEM/a86c026358bf4c1fad4c1942d120c13f.png?resizew=215)
(1)直接写出点B、C的坐标,B ;C .
(2)点P是y轴右侧拋物线上的一点,连接PB、PC.若△PBC的面积15
,求点P的坐标.
(3)设E为线段BC上一点(不含端点),连接AE,一动点M从点A出发,沿线段AE以每秒一个单位速度运动到E点,再沿线段EC以每秒2个单位的速度运动到C后停止,当点E的坐标是 时,点M在整个运动中用时最少,最少用时是 秒.
(4)若点Q在y轴上,当∠AQB取得最大值时,直接写出点Q的坐标 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2018/9/28/2042186072752128/2045744426123264/STEM/a86c026358bf4c1fad4c1942d120c13f.png?resizew=215)
(1)直接写出点B、C的坐标,B ;C .
(2)点P是y轴右侧拋物线上的一点,连接PB、PC.若△PBC的面积15
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(3)设E为线段BC上一点(不含端点),连接AE,一动点M从点A出发,沿线段AE以每秒一个单位速度运动到E点,再沿线段EC以每秒2个单位的速度运动到C后停止,当点E的坐标是 时,点M在整个运动中用时最少,最少用时是 秒.
(4)若点Q在y轴上,当∠AQB取得最大值时,直接写出点Q的坐标 .
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【推荐2】对于平面直角坐标系
中的点
和图形
,给出如下定义:若图形
上存在两个点
,使得
是边长为2的等边三角形,则称点
是图形
的一个“和谐点”.
已知直线
与
轴交于点
,与
轴交于点
的半径为
.
![](https://img.xkw.com/dksih/QBM/2020/6/25/2492089120243712/2492359722237952/STEM/8b7809b0efb44858b787b8225fbcc1e4.png?resizew=214)
(1)若
,在点
中,直线
的和谐点是___________;
(2)若
上恰好存在2个直线
的和谐点,求
的取值范围;
(3)若
,线段
上存在
的和谐点,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
已知直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/251a8da1e1d83f1ce9804634b1b61f3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3def35c669e166d9f347a87b6b555c44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://img.xkw.com/dksih/QBM/2020/6/25/2492089120243712/2492359722237952/STEM/8b7809b0efb44858b787b8225fbcc1e4.png?resizew=214)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfd09fb9482124fd35f19b86894648f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7458c72d1ac3adc1c949948239678f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1812ef3f6e6249b054b1fbdf940019e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00b18ec0eb50e026530d477a54ca55cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
您最近一年使用:0次
【推荐3】对于直角坐标系 xOy 中的点P和⊙C,给出如下定义:若⊙C上存在两个点A,B,使得点P在射线BC上,且∠APB=
∠ACB(0°<∠ACB<180°),则称P为⊙C的依附点.
(1)当⊙O的半径为1时
①已知点D(﹣1,0),E(0,﹣2),F(2.5,0),在点D,E,F中,⊙O的依附点是___;
②点T在直线y=
x上,若T为⊙O的依附点,求点T的横坐标t的取值范围;
(2)⊙C的圆心在x轴上,半径为1,直线 y=﹣2x+2与x轴、y 轴分别交于点M、N,若线段MN上的所有点都是⊙C 的依附点,请求出圆心C的横坐标n的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
(1)当⊙O的半径为1时
①已知点D(﹣1,0),E(0,﹣2),F(2.5,0),在点D,E,F中,⊙O的依附点是___;
②点T在直线y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(2)⊙C的圆心在x轴上,半径为1,直线 y=﹣2x+2与x轴、y 轴分别交于点M、N,若线段MN上的所有点都是⊙C 的依附点,请求出圆心C的横坐标n的取值范围.
您最近一年使用:0次