如图,在平面直角坐标系
中,过
外一点
引它的两条切线,切点分别为
,
,若
,则称
为
的环绕点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/66c6bcbe-a5d4-44c3-a4d0-3bdb69584628.png?resizew=276)
(1)当
半径为
时,
①在
,
,
中,
的环绕点是______;
②直线
与
轴交于点
,
轴交于点
,若线段
上存在
的环绕点,求
的取值范围;
(2)
的半径为
,圆心为
,以(m,
)(
)为圆心,
为半径的所有圆构成图形
,若在图形
上存在
的环绕点,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/9347ab0d001ed7e8f51f9886ce88ac64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35af0e33a8545858094b36ede9010d67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9347ab0d001ed7e8f51f9886ce88ac64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/66c6bcbe-a5d4-44c3-a4d0-3bdb69584628.png?resizew=276)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
①在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f1412750bd2dd9b838674f350960996.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615ea78ab47f0468564fe44dc16f6366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3395d9965ee26f93e94457722107486a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
②直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bebb3b7f47e0decd48e64cb32aaa5903.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9347ab0d001ed7e8f51f9886ce88ac64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180735d52856f4393e40e28e7fcc95bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c00653a92e7962ecc3a9cc1a4a49e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c00653a92e7962ecc3a9cc1a4a49e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9347ab0d001ed7e8f51f9886ce88ac64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
更新时间:2022-09-19 22:20:04
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图,在平面直角坐标系
中,直线l:
与x轴,y轴分别交于A,B两点,动点
在x轴的正半轴上,以
为底在x轴上方作等腰
,使得底边
上的高等于
.
(1)如图1,当点N在直线l下方时,求a的取值范围;
(2)如图2,当点N在直线l上方时,
分别交直线l于E,F两点.
①连接
,当
时,直接写出点F的坐标,并证明
;
②将
沿着直线l对折,点N的对应点为
,若点
落在x轴上方,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b02f8f0580f1ce035f8ecdb29e292e47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d06e0f1cf4e9ed5003bf7dabfc79a9ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25dd698d57d1cf239eb8752aecaaa4f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/20/b70bc94a-6db2-4af4-a3bf-5d8ad73b7a6d.png?resizew=390)
(1)如图1,当点N在直线l下方时,求a的取值范围;
(2)如图2,当点N在直线l上方时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/220af38e72d56a061131347e52825e7f.png)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279563c3c055777ce1aa369a2ef54aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c355f11471a38f5583a434a1ddeb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1c5090e8be00d9c7870ad60139aa59d.png)
②将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/690a4dccad442f711b57e8eecb84ee75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28b1ba4307cfde9b424d468bfcdf6c5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28b1ba4307cfde9b424d468bfcdf6c5a.png)
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解答题-问答题
|
较难
(0.4)
解题方法
【推荐2】如图,在平面直角坐标系中,O为坐标原点,A、B两点的坐标分别为A(m,0)、B(0,n),且
,点P从点A出发,以每秒2个单位的速度沿射线AO匀速运动,设点P的运动时间为t秒.
(1)求OA、OB的长;
(2)连接PB,当
时,求t的值.
(3)过点P作直线AB的垂线,垂足为D,直线PD与y轴交于点E,在点P的运动过程中,是否存在这样的点P,使得
?若存在,请求出t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eefbe5ad678b582b69d96618b10778d5.png)
(1)求OA、OB的长;
(2)连接PB,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c77a91c0aa63b3ce5d46cd494c3b8110.png)
(3)过点P作直线AB的垂线,垂足为D,直线PD与y轴交于点E,在点P的运动过程中,是否存在这样的点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36ca7cfde74a1bb6ed4c7b127639f9e0.png)
![](https://img.xkw.com/dksih/QBM/2021/1/13/2635106386731008/2639439277056000/STEM/fbc08face6e44201ad784851b845fc93.png?resizew=357)
您最近一年使用:0次
解答题-问答题
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较难
(0.4)
【推荐1】概念理解:
如图 1,若将⊙ O 沿着它的一条弦 BC 折叠,则折叠后的图形叫“叠圆”.
概念应用:
在如图 2 的“叠圆”中,折叠后的弧 BC 与直径 AB 相交于点 D ,连接CD.
(1)若点 D 恰好与点O 重合,则ABC =__________°;
(2)延长CD 交⊙O 于点 M ,连接 BM ,猜想ABC 与ABM 的数量关系,并说明理由.
拓展探究:
(3)在如图 3 的“叠圆”中,折叠后的弧 BC 与弦 AB 相交于点 D , D 恰好为 AB 的中点.若⊙O 的半径为
,弦 AB =4,求ABC 的度数和折痕 BC 的长.
如图 1,若将⊙ O 沿着它的一条弦 BC 折叠,则折叠后的图形叫“叠圆”.
概念应用:
在如图 2 的“叠圆”中,折叠后的弧 BC 与直径 AB 相交于点 D ,连接CD.
(1)若点 D 恰好与点O 重合,则ABC =__________°;
(2)延长CD 交⊙O 于点 M ,连接 BM ,猜想ABC 与ABM 的数量关系,并说明理由.
拓展探究:
(3)在如图 3 的“叠圆”中,折叠后的弧 BC 与弦 AB 相交于点 D , D 恰好为 AB 的中点.若⊙O 的半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/21/931a2d0c-b674-4cae-8e17-3ba2ada9d9cf.png?resizew=469)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
真题
名校
【推荐2】如图,
是
的直径,
是
上一点,
是
的中点,
为
延长线上一点,且
,
与
交于点
,与
交于点
.
![](https://img.xkw.com/dksih/QBM/2019/6/24/2232495514378240/2232569382248448/STEM/061bbf4111e643549dc152d1b62774b0.png?resizew=153)
(1)求证:
是
的切线;
(2)若
,
,求直径
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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ea3ae27354258c27345090a0fe5533c.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/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2019/6/24/2232495514378240/2232569382248448/STEM/061bbf4111e643549dc152d1b62774b0.png?resizew=153)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7840fa5be74a09f3b9f079df54c3934a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bade5ba7a4c3354396f4c5e9501b6ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次