如图,以△ABC的边AC上一点O作⊙O经过点B、C,交AC于点D.连接BD,作OG∥BD交⊙O于点G,交BC于点E,连接DG交BC于点F.
![](https://img.xkw.com/dksih/QBM/2022/6/7/2996329070698496/2996886701531136/STEM/760576a8f9b24b308f2a1be3a75a556a.png?resizew=144)
(1)当∠ABD=∠C时,求证:AB为⊙O的切线;
(2)若GB=4,GD=8,求FD的长;
(3)若sin∠GDB=
,求tan∠BGD的值.
![](https://img.xkw.com/dksih/QBM/2022/6/7/2996329070698496/2996886701531136/STEM/760576a8f9b24b308f2a1be3a75a556a.png?resizew=144)
(1)当∠ABD=∠C时,求证:AB为⊙O的切线;
(2)若GB=4,GD=8,求FD的长;
(3)若sin∠GDB=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb84f6fbac102ccf326b2223d69cb7cc.png)
更新时间:2022-06-08 13:24:30
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真题
【推荐1】如图,在
中,
,以
为圆心,
的长为半径的圆交边
于点
,点
在边
上且
,延长
交
的延长线于点
.
是圆的切线;
(2)已知
,
,求
长度及阴影部分面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa3ed73c69ee962f2cbd1b9f62f38b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fffc2a946e72f26a8af584d8ead3a396.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/908ef25e2d61ea6bd3cf2a3fe1235c60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9620e97567191461f1a87aebb7b4f69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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名校
【推荐2】如图,
是
的直径,
是半圆
上一点,过点
作
,垂足为
;再作直线
,使
.
![](https://img.xkw.com/dksih/QBM/2022/3/25/2943997956554752/2944734762074112/STEM/7ee8ba41-a15b-4bf9-a8e8-293323bfa883.png?resizew=204)
(1)求证:
是
的切线;
(2)若
半径为
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61232581e17bfecfeb12b1af7a2717d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0499c1a9f400c070dcfe3ead6a2ad7e.png)
![](https://img.xkw.com/dksih/QBM/2022/3/25/2943997956554752/2944734762074112/STEM/7ee8ba41-a15b-4bf9-a8e8-293323bfa883.png?resizew=204)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520b756756c7e6236056c3f490dafa5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
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【推荐1】【问题探究】
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/5/5ff9329f-0e91-4ebd-9951-1bc87d452893.png?resizew=345)
(1)如图①,在矩形
中,点E为边
上一点,
于点F,点G为边
上一点,连接
,过点E作
于点P,交
于点H,求证:
;
(2)【问题解决】如图②,矩形
为某开发区的一片空地,点E、F分别为边
、
上的点,经测量,
米,
米,开发商现欲在
边上找一点
,使得四边形
的面积为67600平方米,设计人员的设计过程如下:
①以点F为圆心,任意长为半径画弧,交
于M、N两点;
②分别以点M、N为圆心,大于
长为半径画弧,两弧交于点P;
③连接
并延长,分别交
、
于点H、G.
请问:若按上述作法,得到的点G是否符合要求?请证明你的结论.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/5/5ff9329f-0e91-4ebd-9951-1bc87d452893.png?resizew=345)
(1)如图①,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1a1fd2fc33e89f357cef772ff6cd0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18998d725cbbc127f5955fcabebf29f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1302b36a6b760c84c0e2012e96401ab2.png)
(2)【问题解决】如图②,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/978b0f94b87a8b728a29e1588bf8b0e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d92a7575194fb58a4772fb3afc07efd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbad16d8800f6d55bd66bd64b1370e4a.png)
①以点F为圆心,任意长为半径画弧,交
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
②分别以点M、N为圆心,大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94e1ca12da27075e5241b7c7ce74672.png)
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
请问:若按上述作法,得到的点G是否符合要求?请证明你的结论.
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【推荐2】如图,抛物线y=﹣(x﹣1)2+4与x轴交于点A,B(点A在点B的左侧),与y轴交于点C,CD∥x轴交抛物线于另一点D,连结AC,DE∥AC交边CB于点E.
(1)求A,B两点的坐标;
(2)求△CDE与△BAC的面积之比.
(1)求A,B两点的坐标;
(2)求△CDE与△BAC的面积之比.
![](https://img.xkw.com/dksih/QBM/2018/12/6/2090787619913728/2092323630358528/STEM/e2ee1dca5fdc4271849600cd976b22fb.png?resizew=180)
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【推荐1】如图,在
中,
,O、D分别为AB、BC上的点. 经过A、D两点的
分别交AB、AC于点E、F,且D为弧EF的中点.
(1)求证:BC与
相切;
(2)当
,
时. 求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/13/96123515-b629-4860-ac5a-f3c8999ced94.png?resizew=155)
(1)求证:BC与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4746df85049d1651d3f6c30212a7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65639672f444b3d4dc6fc4f357ddbd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
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解答题-证明题
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【推荐2】如图,线段
经过
的圆心
,交
于
,
两点,
为
的弦,连接
,
,连接
并延长,交
于点
,连接
交
于点
.
是
的切线;
(2)求证:
;
(3)若
,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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7782e4606d21511a283675e998707557.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b63d2504bd3ecce8c10560b142356f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/937ae54fcb5281db24a0feadb4939eaf.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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