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
11-12高三上·河南焦作·期末
2 . 如图,⊙O1与⊙O2相交于A、B两点,过点A作⊙O1的切线交⊙O2于点C,过点B作两圆的割线,分别交⊙O1、⊙O2于点D、E,DE与AC相交于点P.
(1)求证:AD//EC;
(2)若AD是⊙O2的切线,且PA=6,PC =2,BD =9,求AD的长.
(1)求证:AD//EC;
(2)若AD是⊙O2的切线,且PA=6,PC =2,BD =9,求AD的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/c4aac7c2-bfd7-43b5-809d-3078379da398.png?resizew=224)
您最近一年使用:0次
2016-12-01更新
|
286次组卷
|
5卷引用:2015届黑龙江省哈尔滨六中高三下学期第四次模拟理科数学试卷
2015届黑龙江省哈尔滨六中高三下学期第四次模拟理科数学试卷2015届黑龙江省哈尔滨六中高三下学期第四次模拟文科数学试卷(已下线)2012届河南省中原六校高三第一次联考理科数学试卷2016届黑龙江省大庆一中高三下学期开学考试理科数学试卷(已下线)2011届河南省焦作市高三第一学期期末考试数学文卷
2011·黑龙江·一模
3 . 选修4-1:几何证明选讲
如图,直线
经过圆
上的点
,并且
圆
交直线
于
,
,连接
.
(Ⅰ)求证:直线
圆
的切线;
(Ⅱ)若
,圆
的半径为3,求
的长.
如图,直线
![](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/6b9ea5432b5b54aa784e976b3312f47c.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a63295afb045510843bf4dd8d8fce0.png)
(Ⅰ)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/219a483b5834a9d8d6bd00fd0458ab01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://img.xkw.com/dksih/QBM/2011/3/16/1570042684358656/1570042689593344/STEM/5be781be9a944b2dac9aa26efff3549a.png?resizew=182)
您最近一年使用:0次
2016-11-30更新
|
1052次组卷
|
5卷引用:2011届黑龙江省哈三中等四校高三第一次模拟考试数学理卷
(已下线)2011届黑龙江省哈三中等四校高三第一次模拟考试数学理卷(已下线)2011届黑龙江省哈三中高三第一次模拟考试数学理卷2016届吉林省吉林大学附中高三上第四次摸底文科数学试卷(已下线)2012届辽宁省本溪一中、庄河高中高三上学期期末理科数学2014-2015学年河南省确山县二中高二4月月考文科数学试卷
2013·黑龙江齐齐哈尔·二模
4 . 如图,已知
均在⊙O上,且
为⊙O的直径.
(1)求
的值;
(2)若⊙O的半径为
,
与
交于点
,且
、
为弧
的三等分点,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1d75df9d80ce1e0b7cb50464e293864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3627d2726f5f777a8772eacae1dce23c.png)
(2)若⊙O的半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2013/8/23/1571320617975808/1571320623661056/STEM/a67106aac278406991e9eb2245c8a4a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://img.xkw.com/dksih/QBM/2013/8/23/1571320617975808/1571320623661056/STEM/fd9129c2c276419ba42d18ec26766414.png)
您最近一年使用:0次
2013·甘肃兰州·一模
5 . 如图, ⊙O为
的外接圆,直线
为⊙O的切线,切点为
,直线
∥
,交
于
,交⊙O于
,
为
上一点,且
.
![](https://img.xkw.com/dksih/QBM/2013/5/29/1571233000996864/1571233006641152/STEM/cbc8f63db6394bd88a5b4a17e4928b2a.png)
求证:(Ⅰ)
;
(Ⅱ)点
、
、
、
共圆.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d85f4e9d1e800b95f446ec8385bdfb6.png)
![](https://img.xkw.com/dksih/QBM/2013/5/29/1571233000996864/1571233006641152/STEM/cbc8f63db6394bd88a5b4a17e4928b2a.png)
求证:(Ⅰ)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72b268f8d0ed74f6d4d21c4d139b246f.png)
(Ⅱ)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
您最近一年使用:0次
2013·辽宁·二模
6 . 如图,AB为⊙O的直径,过点B作⊙O的切线BC,OC交⊙O于点E,AE的延长线交BC于点D.
![](https://img.xkw.com/dksih/QBM/2014/9/12/1571851507941376/1571851513987072/STEM/b372aca9380d4d73b33d84e9dcdcadbc.png)
(1)求证:CE2 =" CD" · CB;
(2)若AB =" BC" = 2,求CE和CD的长.
![](https://img.xkw.com/dksih/QBM/2014/9/12/1571851507941376/1571851513987072/STEM/b372aca9380d4d73b33d84e9dcdcadbc.png)
(1)求证:CE2 =" CD" · CB;
(2)若AB =" BC" = 2,求CE和CD的长.
您最近一年使用:0次
2012·河南焦作·一模
7 . 在
中,AB=AC,过点A的直线与其外接圆交于点P,交BC延长线于点D.
![](https://img.xkw.com/dksih/QBM/2012/7/12/1570923707105280/1570923712651264/STEM/13cf603650fe4de19d4d0d65cea4b9fc.png)
(1)求证:
;
(2)若AC=3,求
的值.
![](https://img.xkw.com/dksih/QBM/2012/7/12/1570923707105280/1570923712651264/STEM/4068bd6d669d4586b69702cb3762e8c2.png)
![](https://img.xkw.com/dksih/QBM/2012/7/12/1570923707105280/1570923712651264/STEM/13cf603650fe4de19d4d0d65cea4b9fc.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2012/7/12/1570923707105280/1570923712651264/STEM/0a245338e40a4c728e67305b45866c4f.png)
(2)若AC=3,求
![](https://img.xkw.com/dksih/QBM/2012/7/12/1570923707105280/1570923712651264/STEM/3d841a1467fa49a59809ed6a011bc517.png)
您最近一年使用:0次
2016-12-02更新
|
349次组卷
|
9卷引用:2012届黑龙江省哈六中高三第三次模拟考试理科数学试卷
(已下线)2012届黑龙江省哈六中高三第三次模拟考试理科数学试卷(已下线)2012届河南省焦作市高三第一次质量检测理科数学试卷(已下线)2012届河南省焦作市高三第一次质量检测文科数学试卷(已下线)2012届河北省唐山一中高三第一次高考仿真测试理科数学试卷(已下线)2013届甘肃省河西五市部分普通高中高三第二次(5月)联考理科数学试卷2015届宁夏固原市第一中学高三最后冲刺模拟文科数学试卷(已下线)2014届云南部分名校(玉溪一中)高三11月月考理科数学试卷2014-2015学年河南省确山县二中高二4月月考文科数学试卷2016届湖南省长沙市一中高三月考八理科数学试卷
2011·辽宁锦州·一模
8 . 如图,在
中,
是的中点,
是
的中点,
的延长线交
于
.
![](https://img.xkw.com/dksih/QBM/2014/1/9/1571469936025600/1571469941858304/STEM/297ef857e4664b6c8ba05f3cfc79c024.png)
(Ⅰ)求
的值;
(Ⅱ)若
面积为
,四边形
的面积为
,求
:
的值.
![](https://img.xkw.com/dksih/QBM/2014/1/9/1571469936025600/1571469941858304/STEM/3ce04ab094c54712a4e3ad563fcc9943.png)
![](https://img.xkw.com/dksih/QBM/2014/1/9/1571469936025600/1571469941858304/STEM/4f41c3ee1763417482ce303999147c48.png)
![](https://img.xkw.com/dksih/QBM/2014/1/9/1571469936025600/1571469941858304/STEM/de5ba8a1801b450f82c9da5b499601ba.png)
![](https://img.xkw.com/dksih/QBM/2014/1/9/1571469936025600/1571469941858304/STEM/004ed952067b42e19576de7d1d53fc1b.png)
![](https://img.xkw.com/dksih/QBM/2014/1/9/1571469936025600/1571469941858304/STEM/febae28ae67b40c9b743ea98525aa2f6.png)
![](https://img.xkw.com/dksih/QBM/2014/1/9/1571469936025600/1571469941858304/STEM/f12efa92f32549418730b289cf04b3a5.png)
![](https://img.xkw.com/dksih/QBM/2014/1/9/1571469936025600/1571469941858304/STEM/c8d72c97371f4897bfd7251118aaf152.png)
![](https://img.xkw.com/dksih/QBM/2014/1/9/1571469936025600/1571469941858304/STEM/297ef857e4664b6c8ba05f3cfc79c024.png)
(Ⅰ)求
![](https://img.xkw.com/dksih/QBM/2014/1/9/1571469936025600/1571469941858304/STEM/aa4ebde1e613485ba27d34bfc7fa032a.png)
(Ⅱ)若
![](https://img.xkw.com/dksih/QBM/2014/1/9/1571469936025600/1571469941858304/STEM/3ce04ab094c54712a4e3ad563fcc9943.png)
![](https://img.xkw.com/dksih/QBM/2014/1/9/1571469936025600/1571469941858304/STEM/f304ed50894148338ae0318dd9e952d4.png)
![](https://img.xkw.com/dksih/QBM/2014/1/9/1571469936025600/1571469941858304/STEM/a08193f3361b49ce8ecc70f419354407.png)
![](https://img.xkw.com/dksih/QBM/2014/1/9/1571469936025600/1571469941858304/STEM/ced9c7fa4216475f8d4645c69a3943ed.png)
![](https://img.xkw.com/dksih/QBM/2014/1/9/1571469936025600/1571469941858304/STEM/f304ed50894148338ae0318dd9e952d4.png)
![](https://img.xkw.com/dksih/QBM/2014/1/9/1571469936025600/1571469941858304/STEM/ced9c7fa4216475f8d4645c69a3943ed.png)
您最近一年使用:0次
2012·黑龙江哈尔滨·一模
9 . 如图所示,已知PA与⊙O相切,A为切点,PBC为割线,
弦
,AD、BC相交于E点,F为CE上一点,且
.
![](https://img.xkw.com/dksih/QBM/2013/2/22/1571119822495744/1571119828467712/STEM/e062988eb28e4976b80639f49da3304f.png?resizew=193)
(1)求证:
;
(2)求证:
.
弦
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a41bcbf7a137218daf88f1deddd2adc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b3abe890d142a4914005d97e740de81.png)
![](https://img.xkw.com/dksih/QBM/2013/2/22/1571119822495744/1571119828467712/STEM/e062988eb28e4976b80639f49da3304f.png?resizew=193)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c073643d7011c90e1b45627ff9f26a4.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0178c66aafd26ee64928316ec84a61ee.png)
您最近一年使用:0次