真题
1 . 如图,EP交圆于E、C两点,PD切圆于D,G为CE上一点且
,连接DG并延长交圆于点A,作弦AB垂直EP,垂足为F.
(1)求证:AB为圆的直径;
(2)若AC=BD,求证:AB=ED.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a3450abdd309e47cd7c33085d68ee.png)
(1)求证:AB为圆的直径;
(2)若AC=BD,求证:AB=ED.
![](https://img.xkw.com/dksih/QBM/2014/6/20/1571783841030144/1571783846731776/STEM/29d6e840-e7ac-492a-8734-63aeab4097ca.png)
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2019-01-30更新
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6卷引用:2014年全国普通高等学校招生统一考试理科数学(辽宁卷)
2014年全国普通高等学校招生统一考试理科数学(辽宁卷)2014年全国普通高等学校招生统一考试文科数学(辽宁卷)(已下线)2013-2014学年黑龙江省鹤岗一中高二下学期期末考试理科数学试卷2016届吉林省实验中学高三上学期二模理科数学试卷福建省2016届高三毕业班总复习(几何选讲)单元过关形成性测试卷(文理科)数学试题云南省保山第九中学2021届高三上学期阶段测试文科数学试题
2 . 如图,
是圆
的切线,切点为
,
是过圆心
的割线且交圆
于点
,过
作圆
的切线交
于点
,
. 求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/e02a68a2e27f6c7a6d03f2fd7a602b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5178fcc1a040999563466fd69ed8b69a.png)
![](https://img.xkw.com/dksih/QBM/2017/12/16/1839787439570944/1841115563515904/STEM/44fde1f05ec4476e974e47f5a282586d.png?resizew=149)
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3 . 如图,已知圆
是
的外接圆,
是
边上的高,
是圆
的直径.
![](https://img.xkw.com/dksih/QBM/2017/11/21/1822048528678912/1823292782215168/STEM/1f4e76b5f4194a3f8016675a3896e26a.png?resizew=167)
(1)求证:
;
(2)过点
作圆
的切线交
的延长线于点
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e47d64e7cd6c3179394120d007ff12a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2017/11/21/1822048528678912/1823292782215168/STEM/1f4e76b5f4194a3f8016675a3896e26a.png?resizew=167)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ed8f57d66aae0f646879f7b41bf0343.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d0da7b2fff904812954936c341960a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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名校
4 . 如图,
、
分别是圆
的切线和割线,其中
为切点,
为切线
的中点,弦
、
相交于点
,弦
延长线上的点
,满足
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b3bbc2f154292f5d767fa24bc3f9d9d.png)
求证:、
、
三点共线的充分必要条件是
、
、
三点共线.
![](https://img.xkw.com/dksih/QBM/2017/8/2/1743616646004736/1745775321595904/STEM/de21a44633ca449299815c7b70691184.png?resizew=214)
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名校
5 . 问题解决
如图(1),将正方形纸片ABCD折叠,使点B落在CD边上一点E(不与点C、D重合),压平后得到折痕MN.当
时,求
的值.
类比归纳
在图(1)中,若
则
的值等于 ;若
则
的值等于 ;若
(n为整数),则
的值等于 .(用含
的式子表示)
联系拓广
如图(2),将矩形纸片ABCD折叠,使点B落在CD边上一点E(不与点C、D重合),压平后得到折痕MN设
,则
的值等
![](https://img.xkw.com/dksih/QBM/2017/9/15/1774670868242432/1776029480919040/STEM/4f484fcb19164ad8a0c3fbf1355874e8.png?resizew=178)
于 ▲ .(用含
的式子表示)
如图(1),将正方形纸片ABCD折叠,使点B落在CD边上一点E(不与点C、D重合),压平后得到折痕MN.当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2913b96dbeb7fa907bc39d09d2ed7de1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643a5b486f9f34760eecf25402fbd7aa.png)
类比归纳
在图(1)中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b24cca14cce4567c6999fabc7c0a4ede.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643a5b486f9f34760eecf25402fbd7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0b2520c9e88e5dfd0618adc20da2469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643a5b486f9f34760eecf25402fbd7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd2f11f4bb440e62083e68f32f6fa96c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643a5b486f9f34760eecf25402fbd7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
联系拓广
如图(2),将矩形纸片ABCD折叠,使点B落在CD边上一点E(不与点C、D重合),压平后得到折痕MN设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5991f5f5a40f0f592e6ee58b154c1eac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643a5b486f9f34760eecf25402fbd7aa.png)
![](https://img.xkw.com/dksih/QBM/2017/9/15/1774670868242432/1776029480919040/STEM/4f484fcb19164ad8a0c3fbf1355874e8.png?resizew=178)
![](https://img.xkw.com/dksih/QBM/2017/9/15/1774670868242432/1776029480919040/STEM/9595017a155b4cecb4aa7a68586bfff8.png?resizew=148)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0877194ab8760f54c35527177b03ff93.png)
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2010·辽宁·一模
名校
6 . 如图所示,
是⊙
直径,弦
的延长线交于
,
垂直于
的延长线于
.求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/f6860ed4-444c-4a28-8e1f-4c93ca5d31c1.png?resizew=161)
(1)
;
(2)
.
![](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/7a84a5193d74f98f5dc5319bd9f92ac6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/f6860ed4-444c-4a28-8e1f-4c93ca5d31c1.png?resizew=161)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20e9f24bb983daa59f863b151e22d62c.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151d70f8913ad2464fc347a6f4203658.png)
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2019-01-30更新
|
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|
12卷引用:2011年辽宁名校领航高考预测试(一)数学卷
(已下线)2011年辽宁名校领航高考预测试(一)数学卷(已下线)2011届吉林省吉林市普通中学高三下学期期中考试数学理卷(已下线)2012届内蒙古呼伦贝尔市牙克石林业一中高三第四次模拟考试理科数学试卷(已下线)2012届内蒙古呼伦贝尔市牙克石林业一中高三第四次模拟考试文科数学试卷(已下线)2013届辽宁省东北育才双语学校高三上学期第一次模拟考试理科数学试卷(已下线)2013届辽宁省五校协作体高三摸底考试理科数学试卷(已下线)2014届高考数学(文)三轮专题体系通关训练倒数第3天练习卷(已下线)2013-2014年吉林省长春市十一中高二下学期期末考试文科数学试卷2016届黑龙江省牡丹江市一中高三上学期期末文科数学试卷2016届宁夏石嘴山三中高三下三模文科数学试卷2016届宁夏石嘴山三中高三下三模理科数学试卷宁夏石嘴山市第三中学2016届高三三模数学(文)试题
真题
7 . 如图,⊙O和⊙
相交于A,B两点,过A作两圆的切线分别交两圆于C,D两点,连接DB并延长交⊙O于点E.证明:
(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/073729989d2cc4db6340a38a3847b8ab.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae7fc3460da984e77d5f5a545c438df.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a2ab6940dca62be1f3b2b5f8531990.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/cef80f46-8848-4c90-9bd0-0abc7add68f4.png?resizew=273)
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2019-01-30更新
|
1160次组卷
|
4卷引用:2012年全国普通高等学校招生统一考试文科数学(辽宁卷)
2012年全国普通高等学校招生统一考试文科数学(辽宁卷)2012年全国普通高等学校招生统一考试理科数学(辽宁卷)(已下线)2014届人教版高考数学文科二轮专题复习提分训练12练习卷2016届宁夏育才中学高三上学期第四次月考理科数学试卷
真题
8 . 如图,
四点在同一圆上,
的延长线与
的延长线交于
点,且
.
![](https://img.xkw.com/dksih/QBM/2011/6/17/1570244935122944/1570244940578816/STEM/be7bbbe6-4c86-4429-add9-aea90d7f4565.png?resizew=152)
(1)证明:
;
(2)延长
到
,延长
到
,使得
,证明:
四点共圆.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c82a10b4f0c9323d726804c89dd9548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b0175dc2b94c0825fc250da0a2ba648.png)
![](https://img.xkw.com/dksih/QBM/2011/6/17/1570244935122944/1570244940578816/STEM/be7bbbe6-4c86-4429-add9-aea90d7f4565.png?resizew=152)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
(2)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43dad1f58af0e8cb85dd1bfa7df597b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ad075b4e1dc31924935b052a5527bf.png)
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2019-01-30更新
|
480次组卷
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6卷引用:2011年辽宁省普通高等学校招生统一考试理科数学
名校
9 . 如图,在△ABC中,BA=BC,以AB为直径的⊙O分别交AC、BC于点D、E,BC的延长线于⊙O的切线AF交于点F.
(1)求证:∠ABC=2∠CAF;
(2)若
,CE∶EB=1∶4,求CE的长.
(1)求证:∠ABC=2∠CAF;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/519d3cbe962154438e43a23b0d9eda2f.png)
![](https://img.xkw.com/dksih/QBM/2017/9/15/1774670868242432/1776029480812544/STEM/b82f2b55378a48f087517123eaa0a8ce.png?resizew=126)
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2017-09-17更新
|
91次组卷
|
2卷引用:山西省忻州市第一中学2017-2018学年高一上学期摸底考试数学试题
10 . 如图,锐角
的内心为
,过点
作直线
的垂线,垂足为点
,点
为内切圆
与边
的切点.
![](https://img.xkw.com/dksih/QBM/2017/9/13/1773137359716352/1774099888963584/STEM/46dc7fc07fef4da496bf8c8bd34f425e.png?resizew=113)
(1)求证:
四点共圆;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2017/9/13/1773137359716352/1774099888963584/STEM/46dc7fc07fef4da496bf8c8bd34f425e.png?resizew=113)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7b615a8ccc8a641df75ac8e11b2e669.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c157441734cc2f1853bb3e15b631a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3b0b11a80e8b107e55534d7fda9f2b.png)
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