1 . 选修4-1:几何证明选讲.
如图,圆周角
的平分线与圆交于点
,过点
的切线与弦
的延长线交于点
,
交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/9a4d7e72-02d8-4427-9ec6-78288d954c03.png?resizew=139)
(1)求证:
;
(2)若
四点共圆,且弧
与弧
相等,求
如图,圆周角
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122327072768/1572122333241344/STEM/9f391813265344e3b84b0add71f8735f.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122327072768/1572122333241344/STEM/53a2deb9e45d47c5a5d523e5f3e9affb.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122327072768/1572122333241344/STEM/53a2deb9e45d47c5a5d523e5f3e9affb.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122327072768/1572122333241344/STEM/42a37ba17bed44ec8b1695afe12d8473.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122327072768/1572122333241344/STEM/e9a7fb85543b434eb8d641b18020d179.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122327072768/1572122333241344/STEM/fdf7e0242d064d49996745aea9a3a32a.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122327072768/1572122333241344/STEM/dafb54ea36c244d6b6cc375a417274fc.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122327072768/1572122333241344/STEM/2baab2bea819401da1ece84a3558ff91.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/9a4d7e72-02d8-4427-9ec6-78288d954c03.png?resizew=139)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122327072768/1572122333241344/STEM/f134a28849784be185d26d443598825a.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122327072768/1572122333241344/STEM/e08368f8215244b28f869c2170e623e4.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122327072768/1572122333241344/STEM/42a37ba17bed44ec8b1695afe12d8473.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122327072768/1572122333241344/STEM/dafb54ea36c244d6b6cc375a417274fc.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1572122327072768/1572122333241344/STEM/9f391813265344e3b84b0add71f8735f.png)
您最近一年使用:0次
2016-12-03更新
|
480次组卷
|
6卷引用:2015届黑龙江省哈尔滨九中高三第三次高考模拟理科数学试卷
2 . 如图,已知
的半径为
,
的半径为
,两圆外切于点
.点
为
上一点,
与
切于点
.若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0385df6c7f8ee7ab503b6ed35933695b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd73875650e1538c4c61d5e16d3db29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0385df6c7f8ee7ab503b6ed35933695b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd73875650e1538c4c61d5e16d3db29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e01ba3f329b712e87ead41125cacd34a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d583183429b6b31aa9742eefc67d3181.png)
![](https://img.xkw.com/dksih/QBM/2018/2/22/1887858184478720/1892230558900224/STEM/5e0ca53af3d2480a9698b0e16b278341.png?resizew=227)
您最近一年使用:0次
2018-02-28更新
|
158次组卷
|
2卷引用:江苏省南通市、泰州市2018届高三年级第一次调研测试数学(理)试题
3 . 选修4-1:几何证明选讲
如图,在
中,
,以
为直径的圆
交
于点
,点
是
边的中点,连接
交圆
于点
.
![](https://img.xkw.com/dksih/QBM/2015/3/26/1572035386146816/1572035392274432/STEM/5d33ff30059d4cac9918bc5566fc1a03.png)
(Ⅰ)求证:
是圆
的切线;
(Ⅱ)求证:
.
如图,在
![](https://img.xkw.com/dksih/QBM/2015/3/26/1572035386146816/1572035392274432/STEM/b795d5170ea74e0e8ae5ac32c6998610.png)
![](https://img.xkw.com/dksih/QBM/2015/3/26/1572035386146816/1572035392274432/STEM/e166a52448f24d6aaf34c5b1f1d2bd89.png)
![](https://img.xkw.com/dksih/QBM/2015/3/26/1572035386146816/1572035392274432/STEM/cc4d42c8f44c4d89a5f831db226ff5fe.png)
![](https://img.xkw.com/dksih/QBM/2015/3/26/1572035386146816/1572035392274432/STEM/a06e96af970c4255ab0e1a25a0182cc4.png)
![](https://img.xkw.com/dksih/QBM/2015/3/26/1572035386146816/1572035392274432/STEM/f7c4c4ac5cb74dbea267c0635e8ee041.png)
![](https://img.xkw.com/dksih/QBM/2015/3/26/1572035386146816/1572035392274432/STEM/b8bea577d29844e395c7fe20cefe6d96.png)
![](https://img.xkw.com/dksih/QBM/2015/3/26/1572035386146816/1572035392274432/STEM/4f683afe39f94899bbe589b1116ed51d.png)
![](https://img.xkw.com/dksih/QBM/2015/3/26/1572035386146816/1572035392274432/STEM/d6f266ed4ce54a349855dcf395fa530b.png)
![](https://img.xkw.com/dksih/QBM/2015/3/26/1572035386146816/1572035392274432/STEM/1a8affa475dd441ab6bbcd06cd8aad47.png)
![](https://img.xkw.com/dksih/QBM/2015/3/26/1572035386146816/1572035392274432/STEM/a06e96af970c4255ab0e1a25a0182cc4.png)
![](https://img.xkw.com/dksih/QBM/2015/3/26/1572035386146816/1572035392274432/STEM/40cb78bd42834166ae60afb21a8c15be.png)
![](https://img.xkw.com/dksih/QBM/2015/3/26/1572035386146816/1572035392274432/STEM/5d33ff30059d4cac9918bc5566fc1a03.png)
(Ⅰ)求证:
![](https://img.xkw.com/dksih/QBM/2015/3/26/1572035386146816/1572035392274432/STEM/ab7882026c6445f0bf667ad98269ccfc.png)
![](https://img.xkw.com/dksih/QBM/2015/3/26/1572035386146816/1572035392274432/STEM/a06e96af970c4255ab0e1a25a0182cc4.png)
(Ⅱ)求证:
![](https://img.xkw.com/dksih/QBM/2015/3/26/1572035386146816/1572035392274432/STEM/22bf2fb0368c4a5cb99a0d7c5356fb8a.png)
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10-11高三·浙江温州·阶段练习
4 . 已知
为圆
的两条相互垂直的弦,垂足为
,则四边形
的面积的最大值为____________________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc12c55f2676aeb4f696f4a84e4d65b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb72838700196acec54327a3ec0ecdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
5 . 如图所示,
为以
为直径的圆
的切线,
为切点,
为圆周上一点,
,直线
交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572684181446656/1572684187820032/STEM/a4ce8c32f06244e1a15242a05c5f3c2d.png)
(1)求证:直线
是圆
的切线;
(2)若
,
,求线段
的长.
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572684181446656/1572684187820032/STEM/f4d399a4d95f4e4986bc69e8addecbcb.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572684181446656/1572684187820032/STEM/d900b01e8d754989b68e7e5da50ae09a.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572684181446656/1572684187820032/STEM/4796d7d1550545f5841f0c855f935413.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572684181446656/1572684187820032/STEM/1e63e56eea8e48aa93d8b128221a22d6.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572684181446656/1572684187820032/STEM/3fe9e2a5e7bd45349202edeae9b53e05.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572684181446656/1572684187820032/STEM/c9bded80d9854945bb7cc5c935b41258.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572684181446656/1572684187820032/STEM/e2ea61d9b5d34e7a804fb12b7f51d9e7.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572684181446656/1572684187820032/STEM/d900b01e8d754989b68e7e5da50ae09a.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572684181446656/1572684187820032/STEM/6d6708a57d764cb6ae1494818111cfb8.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572684181446656/1572684187820032/STEM/a4ce8c32f06244e1a15242a05c5f3c2d.png)
(1)求证:直线
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572684181446656/1572684187820032/STEM/e2ea61d9b5d34e7a804fb12b7f51d9e7.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572684181446656/1572684187820032/STEM/4796d7d1550545f5841f0c855f935413.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572684181446656/1572684187820032/STEM/6e6758e09a3a4ee9a9f59155b6f7a204.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572684181446656/1572684187820032/STEM/390d78d8afa94721bed123c9f813853f.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572684181446656/1572684187820032/STEM/04fd07e407c74c8d9b3865d9ef7e322a.png)
您最近一年使用:0次
2010高三·全国·专题练习
真题
6 . 如图,△ABC的角平分线AD的延长线交它的外接圆于点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e28ce60503fab70ce1797449d90dadc.png)
(Ⅰ)证明:△ABE∽△ADC;
(Ⅱ)若△ABC的面积
,求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e28ce60503fab70ce1797449d90dadc.png)
(Ⅰ)证明:△ABE∽△ADC;
(Ⅱ)若△ABC的面积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec4fccf16c3064c1fe33098ec3e8ae2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://img.xkw.com/dksih/QBM/2011/2/25/1570012428500992/1570012433973248/STEM/a38682262ddd43fea44e49fb2f7163c1.png?resizew=152)
您最近一年使用:0次
2016-11-30更新
|
403次组卷
|
9卷引用:2010年高考试题分项版文科数学之专题十七 选修系列
(已下线)2010年高考试题分项版文科数学之专题十七 选修系列2010年普通高等学校招生全国统一考试(辽宁卷)文科数学全解全析(已下线)2011届宁夏贺兰一中高三上学期期末考试数学理卷2015届甘肃省河西三校普通高中高三上学期第一次联考理科数学试卷2015届甘肃省河西三校普通高中高三上学期第一次联考文科数学试卷2017届广东珠海市高三9月摸底考试数学(理)试卷(已下线)2011-2012学年河南省周口市高二下学期四校第一次联考文科数学试卷(已下线)2013-2014学年河北省石家庄市高二下学期期末考试理科数学试卷河南省郑州市巩义中学2019-2020学年高二下学期期中考试数学(文)试题
11-12高三上·宁夏银川·阶段练习
7 . 如图,
是
的直径,
是弦,
的平分线
交
于
,
交
延长线于点
,
交
于点
.
(I)求证:
是
的切线;
(II)若
,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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(I)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(II)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faf253af4f8c82dad9e17ec2eae47346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929e72e9d26c3bda1fba680ca48cd95d.png)
![](https://img.xkw.com/dksih/QBM/2011/12/21/1570627187744768/1570627193307136/STEM/06290dd6-dd51-47a5-9eb2-d722edbe87a5.png?resizew=201)
您最近一年使用:0次
8 . [选修4-1:几何证明选讲]
如图,从圆
外一点
引圆的切线
及割线
,
为切点.求证:
.
如图,从圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f32565b4979ca95c3335b5d5e9f5712.png)
![](https://img.xkw.com/dksih/QBM/2015/4/22/1572080895492096/1572080901767168/STEM/6ae52e3d5f154f138956a94c63204892.png)
您最近一年使用:0次
9 . 在
中,N是边AC上一点,且
,AB与
的外接圆相切,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b50f83fd73b99fc0e0c61d80346e3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa020cb9948ac34d16b37386f05ff36b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f3cd6a673d7e238ebb769839b6317a9.png)
您最近一年使用:0次
2018-03-07更新
|
148次组卷
|
2卷引用:江苏省常州2018届高三上学期期末数学(理)
10 . 选修4-1:几何证明选讲
如图,四边形
是圆的内接四边形,
,
的延长线交
的延长线于点
,延长
至
.
![](https://img.xkw.com/dksih/QBM/2018/2/14/1882210632376320/1883747638566912/STEM/033d32113fbf4eceb2ac6337e8934abc.png?resizew=292)
求证:
是
的角平分线.
如图,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feb67f27bcda7681b19239a199b4c4d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2018/2/14/1882210632376320/1883747638566912/STEM/033d32113fbf4eceb2ac6337e8934abc.png?resizew=292)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c36ff76f9f1ee12db562cde7a58b8c3.png)
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