1 . 选修4-1:几何证明选讲
如图,过圆
外一点
作一条直线与圆
交
两点,且
,作直线
与圆
相切于点
,连接
交
与点
,已知圆
的半径为2,
.
![](https://img.xkw.com/dksih/QBM/2016/10/31/1573102947753984/1573102953791488/STEM/265bd159d0374fecac19a6bd9be20eaa.png)
(1)求
的长;
(2)求证:
.
如图,过圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70e6f98369bdaa02ee8e8685f8f23d67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e390480dce825d6302a5223cd073d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.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/49b50357a6545cae8348e3059312f520.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/94a3b32f1db027d67ed28e5b2113e79d.png)
![](https://img.xkw.com/dksih/QBM/2016/10/31/1573102947753984/1573102953791488/STEM/265bd159d0374fecac19a6bd9be20eaa.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d315eff37c1bdf5be90b6015b08bdea.png)
您最近一年使用:0次
2 . 选修4-1:几何证明选讲
如图所示,已知
为
的
边上一点,
经过点
,交
于另一点
,
经过点
,交
于另一点
与
交于点
.
![](https://img.xkw.com/dksih/QBM/2016/10/31/1573102650408960/1573102656995328/STEM/5a8f26291fdd46fbab413416b92528b9.png)
(1)求证:
;
(2)若
的半径为5,圆心
到直线
的距离为3,
切
于点
,求线段
的长.
如图所示,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6a2c03b88b9ac5d5641e30f64a462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbdb21011ea821b91d539cb763aac649.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8ef224337c60baeb1327f4f1973a1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8065440f9e61ca5331e85cd9a5d8c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8ef224337c60baeb1327f4f1973a1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/2016/10/31/1573102650408960/1573102656995328/STEM/5a8f26291fdd46fbab413416b92528b9.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a4965e97e3994ac9702a73e1b2b3df.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8ef224337c60baeb1327f4f1973a1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2da1da462918dd5eb035ae3efab21a95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8ef224337c60baeb1327f4f1973a1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
您最近一年使用:0次
3 . 选修4-1:几何证明选讲
如图,已知
与圆
相切,
为切点,
为割线,弦
,
相交于
点,
为
上一点,且
.
![](https://img.xkw.com/dksih/QBM/2016/9/12/1573014847234048/1573014853287936/STEM/7a652be337cc4d25a7aab4a6d67b6a64.png)
(1)求证:
四点共圆;
(2)若
,
,求
的长.
如图,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.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/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a41bcbf7a137218daf88f1deddd2adc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d93949d8a15aca4e79cedb978590571.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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/994e2fc5676a42e4edba54a291236d7c.png)
![](https://img.xkw.com/dksih/QBM/2016/9/12/1573014847234048/1573014853287936/STEM/7a652be337cc4d25a7aab4a6d67b6a64.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21a511ffe1a6617f45c48748a16372cd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5a0689f27f06ebd8468e4a5cbab799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034a9d2e093d0040c609450c3a344cca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
您最近一年使用:0次
4 . 如图,AB是⊙O的直径,AC是⊙O的切线,BC交⊙O于点E.
![](https://img.xkw.com/dksih/QBM/2016/4/19/1572597104369664/1572597110833152/STEM/3c3d5f0111da442e863aae870e774ef1.png)
(Ⅰ)若D为AC的中点,证明:DE是⊙O的切线;
(Ⅱ)若OA=
CE,求∠ACB的大小.
![](https://img.xkw.com/dksih/QBM/2016/4/19/1572597104369664/1572597110833152/STEM/3c3d5f0111da442e863aae870e774ef1.png)
(Ⅰ)若D为AC的中点,证明:DE是⊙O的切线;
(Ⅱ)若OA=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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5 . 自圆
外一点
引圆
的两条割线
和
,如图所示,其中割线
过圆心
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/ef6942b7-ec55-4a78-a65b-b14c8084a08d.png?resizew=208)
(1)求
的大小;
(2)分别求线段
和
的长度.
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/218054144a13435580cd132b9459546c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54d87077425ae6016e8a7cc7293c91fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/ef6942b7-ec55-4a78-a65b-b14c8084a08d.png?resizew=208)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(2)分别求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
您最近一年使用:0次
2016-12-03更新
|
304次组卷
|
2卷引用:2016届江西省名校学术联盟高三第一次调研一理科数学试卷
6 . 如图, AB是圆O的直径,G是AB延长线上的一点,GCD是⊙O的割线,过点G作AG的垂线,交直线AC于点E,交直线AD于点F,过点G作圆O的切线,切点为H.
![](https://img.xkw.com/dksih/QBM/2015/6/10/1572121469919232/1572121476079616/STEM/c4815a07cbfd4097b664c0ac78a7a9b2.png?resizew=189)
(1)求证:C,D,E,F四点共圆;
(2)若GH=6,GE=4,求EF的长.
![](https://img.xkw.com/dksih/QBM/2015/6/10/1572121469919232/1572121476079616/STEM/c4815a07cbfd4097b664c0ac78a7a9b2.png?resizew=189)
(1)求证:C,D,E,F四点共圆;
(2)若GH=6,GE=4,求EF的长.
您最近一年使用:0次
7 . 已知PQ与圆O相切于点A,直线PBC交圆于B、C两点,D是圆上一点,且AB∥DC ,DC的延长线交PQ于点Q.
![](https://img.xkw.com/dksih/QBM/2016/4/12/1572588562546688/1572588568035328/STEM/ac6ae66cfecc4ccab7864831b5a9c67e.png)
(1)求证: AC2=CQ×AB;
(2)若AQ=2AP,AB=
,BP=2,求QD.
![](https://img.xkw.com/dksih/QBM/2016/4/12/1572588562546688/1572588568035328/STEM/ac6ae66cfecc4ccab7864831b5a9c67e.png)
(1)求证: AC2=CQ×AB;
(2)若AQ=2AP,AB=
![](https://img.xkw.com/dksih/QBM/2016/4/12/1572588562546688/1572588568035328/STEM/6c62ee9cadb44de8820f95ed21ba65d8.png)
您最近一年使用:0次
2016-12-03更新
|
316次组卷
|
4卷引用:2015届江西省吉安市一中高三上学期第二次阶段考试理科数学试卷
8 . 选修4—1:几何证明选讲
如图,已知
是
的直径,
是
的切线,
为切点,
,交
于点
,连接
、
、
、
,延长
交
于
.
![](https://img.xkw.com/dksih/QBM/2015/3/30/1572048932945920/1572048938811392/STEM/600be9395db149a7b3a5b81698db52d6.png)
(1)证明:
;
(2)证明:
.
如图,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96dae94a9c26b6dd1dbcdebd20373033.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2015/3/30/1572048932945920/1572048938811392/STEM/600be9395db149a7b3a5b81698db52d6.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddc7897e3f49075943704f4dbef82e5b.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bfda305b29f8d317661772153315d1f.png)
您最近一年使用:0次
2016-12-03更新
|
481次组卷
|
2卷引用:2015届江西省九江市第一次高考模拟统一考试理科数学试卷
2012·山西·模拟预测
9 . 选修4-1:几何证明与选讲
如图,
为直角三角形,
,以
为直径的圆交
于点
,点
是
边的中点,连
交圆
于点
.
![](https://img.xkw.com/dksih/QBM/2012/7/18/1570929345421312/1570929350885376/STEM/65b65a034d9240f586d14af8ffda9f65.png)
(1)求证:
四点共圆;
(2)求证:
.
如图,
![](https://img.xkw.com/dksih/QBM/2012/7/18/1570929345421312/1570929350885376/STEM/4980a3b5704f4f1fb835cfcd19f40dec.png)
![](https://img.xkw.com/dksih/QBM/2012/7/18/1570929345421312/1570929350885376/STEM/b164f1071bf64f9691f0aaafd0ee96e4.png)
![](https://img.xkw.com/dksih/QBM/2012/7/18/1570929345421312/1570929350885376/STEM/e17394ecdcb64168a256b4f9b9145f53.png)
![](https://img.xkw.com/dksih/QBM/2012/7/18/1570929345421312/1570929350885376/STEM/f30d3d5660c04e529ac86af4bb59ec23.png)
![](https://img.xkw.com/dksih/QBM/2012/7/18/1570929345421312/1570929350885376/STEM/8853fde643e14fc09c72ae39351c16c1.png)
![](https://img.xkw.com/dksih/QBM/2012/7/18/1570929345421312/1570929350885376/STEM/c1ee4c09327e48179112a7f0c1d8f798.png)
![](https://img.xkw.com/dksih/QBM/2012/7/18/1570929345421312/1570929350885376/STEM/b2d0c7bef63749faaaa1899b0ae679d7.png)
![](https://img.xkw.com/dksih/QBM/2012/7/18/1570929345421312/1570929350885376/STEM/401d71137cb74eec9ac7f6b990d30d9d.png)
![](https://img.xkw.com/dksih/QBM/2012/7/18/1570929345421312/1570929350885376/STEM/04d5677e1e6e4cab88427ea121168e9f.png)
![](https://img.xkw.com/dksih/QBM/2012/7/18/1570929345421312/1570929350885376/STEM/4bd486e68ac64b1bbc0607bd979b00a4.png)
![](https://img.xkw.com/dksih/QBM/2012/7/18/1570929345421312/1570929350885376/STEM/65b65a034d9240f586d14af8ffda9f65.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2012/7/18/1570929345421312/1570929350885376/STEM/f278726017e446e28a3771ab7f512f29.png)
(2)求证:
![](https://img.xkw.com/dksih/QBM/2012/7/18/1570929345421312/1570929350885376/STEM/8282db9bd45d41b1be919175f0b46978.png)
您最近一年使用:0次