如图,形如量角器的半圆
的直径
,形如三角板的
中,
,
,
,半圆
以
的速度从左向右运动,在运动过程中,点
、
始终在直线
上,设运动时间为
,当
时,半圆
在
的左侧,
.
当
时,点
在半圆
________,当
时,点
在半圆
________;
当
为何值时,
的边
与半圆
相切?
当
为何值时,
的边
与半圆
相切?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc17d52cc7837aefd7b01bedc463166c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b82862a3ea06d5c719ac26406d19f4ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6f3abff471fe76c4d1fdc6c9ca0204f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/334e23d55dca5e96fc6d827b743b7f19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f601546a19f1b6ae7ba6fbc5c08706d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20cde5ca9a6592a9906c608ca9fd150f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/040ebbe6f702609095239a9dceaca65e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764457a17c50147b0d5178657ddcd6fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/040ebbe6f702609095239a9dceaca65e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4267c242b8f7ac9662e7fc6da7985cd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4bb89a362c1faf4d0c306eabbb59710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2018/10/31/2065277190520832/2068491567013888/STEM/396e9faf00f749daa66cd2ab0dbfdc8d.png?resizew=195)
更新时间:2018-11-04 20:59:46
|
【知识点】 圆与三角形的综合(圆的综合问题)
相似题推荐
解答题-证明题
|
较难
(0.4)
解题方法
【推荐1】如图,
为
的直径,
是
的中点,
与
分别交于点
.
(1)求证:
.
(2)求证:
;
(3)若
的直径
,求
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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40ce461475802b9e6e2948e9d2fb0baf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d70de1ffdd9aa376b09bbcfa12644a1.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26ef787a9d06d86111bf8dc9974b9ea.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e8029c02e1d2fda2557788ae62e8522.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1e7d19deea8b2167bef552173dda60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/2020/5/4/2455682651029504/2456211490414592/STEM/86f03d74-0e86-4a08-9064-b6a15ad9b152.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图,
是半圆
的直径,
是
的中点,点
在
上,
,
相交于点
,点
是
上的一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/31/b8cae358-9471-4e1b-abb7-5e9f8d8450e2.png?resizew=151)
(1)求证:
;
(2)连接
,若
.
①求证:
;
②当
的面积为
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c280fc03fdbcf37491a8573850a1df95.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/31/b8cae358-9471-4e1b-abb7-5e9f8d8450e2.png?resizew=151)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1a23f51a2ff0896988930f5209fc64.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662e342297cf339f4aca6b091fec0f1e.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49cb6392b1f859954303066037c5f5fd.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f221c6eff7ed25794b7fe387bee22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐3】阅读理解
在⊙I中,弦AF与DE相交于点Q,则AQ•QF=DQ•QE,你可以利用这一性质解决问题.
问题解决
如图,在平面直角坐标系中,等边△ABC的边BC在x轴上,高AO在y轴的正半轴上,点Q(0,1)是等边△ABC的重心,过点Q的直线分别交边AB、AC于点D、E,直线DE绕点Q转动,设∠OQD=α(60°<α<120°),△ADE的外接圆⊙I交y轴正半轴于点F,连接EF,
(1)填空:AB= ;
(2)在直线DE绕点Q转动的过程中,猜想:
与
的值是否相等?试说明理由.
(3)①求证:AQ2=AD•AE﹣DQ•QE;
②记AD=a,AE=b,DQ=m,QE=m(a、b、m、n均为正数),请直接写出mn的取值范围.
在⊙I中,弦AF与DE相交于点Q,则AQ•QF=DQ•QE,你可以利用这一性质解决问题.
问题解决
如图,在平面直角坐标系中,等边△ABC的边BC在x轴上,高AO在y轴的正半轴上,点Q(0,1)是等边△ABC的重心,过点Q的直线分别交边AB、AC于点D、E,直线DE绕点Q转动,设∠OQD=α(60°<α<120°),△ADE的外接圆⊙I交y轴正半轴于点F,连接EF,
(1)填空:AB= ;
(2)在直线DE绕点Q转动的过程中,猜想:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6382ab4f422e34637be1da08bd00b403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfbf504c97589fe1215356a19aaa4d8f.png)
(3)①求证:AQ2=AD•AE﹣DQ•QE;
②记AD=a,AE=b,DQ=m,QE=m(a、b、m、n均为正数),请直接写出mn的取值范围.
![](https://img.xkw.com/dksih/QBM/2018/9/26/2040535753834496/2044452308762624/STEM/4bfe57d3ef814ac1a40c6c79e62f9187.png?resizew=490)
您最近一年使用:0次