对于平面直角坐标系xOy中的点P和线段AB,给出如下定义:在线段AB外有一点P,如果在线段AB上存在两点C、D,使得∠CPD=90°,那么就把点P叫做线段AB的悬垂点.
(1)已知点A(2,0),O(0,0)
①若
,D(1,1),E(1,2),在点C,D,E中,线段AO的悬垂点是______;
②如果点P(m,n)在直线
上,且是线段AO的悬垂点,求
的取值范围;
(2)如下图是帽形M(半圆与一条直径组成,点M是半圆的圆心),且圆M的半径是1,若帽形内部的所有点是某一条线段的悬垂点,求此线段长的取值范围.
(1)已知点A(2,0),O(0,0)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2eaa891141312eb4309cec386bd1ace.png)
②如果点P(m,n)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/398c1cd295ad00e76e93a506e4c53443.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1573847532494848/1573847538245632/STEM/62118cec92fd4c8c8aba545341609c35.png)
(2)如下图是帽形M(半圆与一条直径组成,点M是半圆的圆心),且圆M的半径是1,若帽形内部的所有点是某一条线段的悬垂点,求此线段长的取值范围.
![](https://img.xkw.com/dksih/QBM/2015/6/15/1573847532494848/1573847538245632/STEM/8a287bce0fd0426890647c9cb80c6d22.png)
2015·北京·一模 查看更多[1]
更新时间:2016-12-06 00:23:55
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【知识点】 其他问题(圆的综合问题)
相似题推荐
解答题-问答题
|
较难
(0.4)
真题
名校
【推荐1】在平面直角坐标系
中,⊙O的半径为1,A,B为⊙O外两点,AB=1.给出如下定义:平移线段AB,得到⊙O的弦
(
分别为点A,B的对应点),线段
长度的最小值称为线段AB到⊙O的“平移距离”.
![](https://img.xkw.com/dksih/QBM/2020/7/19/2509031272955904/2509164014649344/STEM/64558c86c8cb47d193854eff8d909df1.png?resizew=214)
(1)如图,平移线段AB到⊙O的长度为1的弦
和
,则这两条弦的位置关系是 ;在点
中,连接点A与点 的线段的长度等于线段AB到⊙O的“平移距离”;
(2)若点A,B都在直线
上,记线段AB到⊙O的“平移距离”为
,求
的最小值;
(3)若点A的坐标为
,记线段AB到⊙O的“平移距离”为
,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/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77993759b8615ef0b42cb56ef027ff0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://img.xkw.com/dksih/QBM/2020/7/19/2509031272955904/2509164014649344/STEM/64558c86c8cb47d193854eff8d909df1.png?resizew=214)
(1)如图,平移线段AB到⊙O的长度为1的弦
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a949c00526fddf435423272cf10f25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bb1a6e4213ad6d280e058d207f499db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4addb17d99993f4beb82d63d203bb33.png)
(2)若点A,B都在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/804fee08a09d73c05f05ff88dbfff125.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edf900c810371fb21297c15f86d8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edf900c810371fb21297c15f86d8743.png)
(3)若点A的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2f4b6055b194edfa32f77d2c6df675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31ac1def558351e2e3ed1235c570530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31ac1def558351e2e3ed1235c570530.png)
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解答题-证明题
|
较难
(0.4)
【推荐2】如图,已知
是
的直径,弦
于点
,点
是线段
延长线上的一点,连接
交
于点
,连结
交
于点
,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/b00e1f98-fcf4-4d75-b295-9231d9ad1ed4.png?resizew=174)
(1)求证:
.
(2)若
,求
的值.
(3)在(2)的条件下,设
,
.
①求
关于
的函数表达式;
②若
为
的中点,求
的值.
![](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/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/b00e1f98-fcf4-4d75-b295-9231d9ad1ed4.png?resizew=174)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7a9d0490454cec4b5005e0c21ee18ae.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87d75cecc3a0f28b65ce7d1de7e9c36c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6ff13b1cb8e5d805811e904a2d6f6cd.png)
(3)在(2)的条件下,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8beb9a6cda1bb89cac02974e6e2a8622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b6c6a34abfcb78e52c01ca60250bdd3.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85fb9ac7497c05f82c2b86fa9e0625fd.png)
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【推荐3】问题背景:在学习课本例题“矩形ABCD的四个顶点A,B,C,D在同一个圆上”后,小明进行了如下研究:
(1)如图1,四边形ABCD中,∠BAD=∠BCD=90°.AC、BD是对角线,取BD的中点O,连接OA,OC,得点A,B,C,D在⊙O上,进而可得∠BAC=∠BDC,请帮小明按照思路补全图形,并写出证明过程;
迁移应用:(2)如图2,四边形ABCD中,∠BAD=∠BCD=90°,∠ADB=2∠CAD,证明:AB=2CE;
拓展应用:(3)如图3,在Rt
中,∠ABC=90°,∠BAC=60°,AC=6,若点D满足AD=AC,点E是CD中点,若CD=4,直接写出BE的值.
(1)如图1,四边形ABCD中,∠BAD=∠BCD=90°.AC、BD是对角线,取BD的中点O,连接OA,OC,得点A,B,C,D在⊙O上,进而可得∠BAC=∠BDC,请帮小明按照思路补全图形,并写出证明过程;
迁移应用:(2)如图2,四边形ABCD中,∠BAD=∠BCD=90°,∠ADB=2∠CAD,证明:AB=2CE;
拓展应用:(3)如图3,在Rt
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2021/1/20/2640351274737664/2640785925537792/STEM/b830f1c51ef44bc98db1bfebf47248f2.png?resizew=554)
您最近一年使用:0次