1 . 如图所示,已知
和
相交于
两点,过
点作
的切线交
于点
,过点
作两圆的割线,分别交
、
于点
与
相交于点
.
![](https://img.xkw.com/dksih/QBM/2016/9/12/1573014232514560/1573014238773248/STEM/d0abdb0c8ad44d3b87e3b19e56244f18.png)
(Ⅰ)求证:
;
(Ⅱ)若
是
的切线,且
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6a2c03b88b9ac5d5641e30f64a462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8ef224337c60baeb1327f4f1973a1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7bdc75c9a9fba398e737d4832101f60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6a2c03b88b9ac5d5641e30f64a462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8ef224337c60baeb1327f4f1973a1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe6a2c03b88b9ac5d5641e30f64a462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8ef224337c60baeb1327f4f1973a1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8c95ab1103b4ff9fff18eb90c7df9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2016/9/12/1573014232514560/1573014238773248/STEM/d0abdb0c8ad44d3b87e3b19e56244f18.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f24398a4072971f71f273bf34737da15.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8ef224337c60baeb1327f4f1973a1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8b2e4d424dd04c5ed52385c0181e441.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次
2 . 选修4-1:几何证明选讲
如图,
是
的内接三角形,
是
的切线,
是线段
上一点,经过
作
的平行直线与
交于
点,与
交于
点.
![](https://img.xkw.com/dksih/QBM/2016/9/9/1573010431688704/1573010437718016/STEM/7967b2263a6a46c8b405174ab067c221.png)
(1)求证:
;
(2)若
,求
的面积.
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7bf58e5fea1189b33cf55d86335452f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7bf58e5fea1189b33cf55d86335452f.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2016/9/9/1573010431688704/1573010437718016/STEM/7967b2263a6a46c8b405174ab067c221.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c91f17f78e4b800a20a7726dcad30d0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db8e8ffcb352356258b8dcc374d1506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
您最近一年使用:0次
2016-12-04更新
|
233次组卷
|
2卷引用:2016届云南省高三第二次统一检测数学(理)试卷
3 . 选修4-1:几何证明选讲
已知点
是圆
外的一点,过
作圆
的切线
,切点为
,过
作一割线交圆
于点
,若
,取
的中点
,连接
,并延长交圆于
.
![](https://img.xkw.com/dksih/QBM/2016/9/8/1573006592401408/1573006598922240/STEM/d669c87664da42e78176d59022d6c8c1.png)
(1)求证:
四点共圆;
(2)求证:
.
已知点
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790ef3382b1c731f2885eecfd92c2a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.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/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a331c53433e7b7472361b5a5bdf2d2f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/2016/9/8/1573006592401408/1573006598922240/STEM/d669c87664da42e78176d59022d6c8c1.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b89f0348aabf400d5a68674e4360261d.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/593f21796cf321a7886d1c8bffe6075a.png)
您最近一年使用:0次
2016-12-04更新
|
109次组卷
|
2卷引用:2016届广西五市高三5月联合模拟数学(理)试卷
4 . 选修4-1:几何证明选讲
如图,
的外接圆为⊙
,延长
至
,再延长
至
,使得
成为
,
的等比中项.
![](https://img.xkw.com/dksih/QBM/2016/9/8/1573005992738816/1573005998833664/STEM/afe72850fd8b4cefba8a1d18eb32eaa0.png)
(1)求证:
为⊙
的切线;
(2)若
恰好为
的平分线,
,
,求
的长度.
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf25e032b5599ac49383de06e776365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf25e032b5599ac49383de06e776365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350e954f629c1901a5cec03558319e46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf702adb116c1e46569eb7050d029f49.png)
![](https://img.xkw.com/dksih/QBM/2016/9/8/1573005992738816/1573005998833664/STEM/afe72850fd8b4cefba8a1d18eb32eaa0.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf25e032b5599ac49383de06e776365.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ab1b4d52dc296acb2764f333bd4343f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf25e032b5599ac49383de06e776365.png)
您最近一年使用:0次
5 . 选修4-1:几何证明选讲
如图,
和
相交于
两点,过
作两圆的切线分别交两圆于
两点,连结
并延长交
于点
,已知
.
![](https://img.xkw.com/dksih/QBM/2016/9/7/1573003835777024/1573003842297856/STEM/7f870ad8fba84b878d51a9f0e83596ab.png)
(Ⅰ)求
的值;
(Ⅱ)求线段
的长.
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61215255bf31fc9cfcde64a430082a59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82039599168d4f4258b5649a604452e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e8c2ba43e61377ac004c21a8a9cd255.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2016/9/7/1573003835777024/1573003842297856/STEM/e187126688af47108828b54e2bcb9a64.png)
![](https://img.xkw.com/dksih/QBM/2016/9/7/1573003835777024/1573003842297856/STEM/7f870ad8fba84b878d51a9f0e83596ab.png)
(Ⅰ)求
![](https://img.xkw.com/dksih/QBM/2016/9/7/1573003835777024/1573003842297856/STEM/3ab014b7234a43249451589eda149742.png)
(Ⅱ)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
6 . 选修4-1:几何证明选讲
如图,
是
的外接圆,
的平分线
交
于
,交
于
,连接
并延长, 交
于
,交
于
.
![](https://img.xkw.com/dksih/QBM/2016/9/7/1573003126251520/1573003132870656/STEM/a5e23fa7201644d1bf658198a0a2c24e.png)
(1)证明:
;
(2)若
求
的长.
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6062582a0a1679aa777451f25008411d.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/8455657dde27aabe6adb7b188e031c11.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/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2016/9/7/1573003126251520/1573003132870656/STEM/a5e23fa7201644d1bf658198a0a2c24e.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5c2123f90f931140fe9f85a3e61e30d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04a30bf456a72760e9a91e070752d8a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次
2016-12-04更新
|
120次组卷
|
3卷引用:2016届山西晋城市高三下学期三模考试理数学试卷
7 . 选修4-1:几何证明选讲
如图,点
为圆
上一点,
为圆的切线,
为圆的直径,
.
![](https://img.xkw.com/dksih/QBM/2016/9/7/1573002292027392/1573002298654720/STEM/e00d7686f2f74905a4e5cc20675e6bda.png)
(1)若
交圆
于点
,
,求
的长;
(2)若连接
并延长交圆
于
、
两点,
于
,求
的长.
如图,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca66a268d6f46e0e9d5d9151b785be60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81574a3738c0a314293ff7c74248971.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4709e7fb4cb71678ea2b651e764f7eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec5402fd66f25b025c2f89c0897354d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b30be2ed62f1f7c66141587c55a99730.png)
![](https://img.xkw.com/dksih/QBM/2016/9/7/1573002292027392/1573002298654720/STEM/e00d7686f2f74905a4e5cc20675e6bda.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caef922685cef76f1ad8475c29bd04a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81574a3738c0a314293ff7c74248971.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2391c0e2fc44598610d519dacb778062.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ff05e4dc3d4edf8799e02e19d3986d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec5402fd66f25b025c2f89c0897354d9.png)
(2)若连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f1c7a1c15c00631924d3b5f8bfadd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81574a3738c0a314293ff7c74248971.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aa5694373bd78b1ca2180f831bf1c8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2252dec4cf2fd59caff617269567806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48895a93a9170775c1a8a76dd058ae58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f0b669ef4514f24ee09adeff7f41238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a44be92f38e063a01b8cd67418815cd.png)
您最近一年使用:0次
2016-12-04更新
|
217次组卷
|
2卷引用:2016届河南新乡名校学术联盟高三高考押题四理数学试卷
8 . 选修4-1:几何证明选讲
已知如图,四边形
是圆
的内接四边形,对角线
交于点
,直线
是圆
的切线,切
点为
,
.
![](https://img.xkw.com/dksih/QBM/2016/9/5/1572994627854336/1572994634260480/STEM/7ac423a9960b4cfc89f3dfff0e2c0617.png)
(1)若
,求
的长;
(2)在
上取一点
,若
,求
的大小.
已知如图,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac07c8a89cc64fde478fff9da45b7ad.png)
![](https://img.xkw.com/dksih/QBM/2016/9/5/1572994627854336/1572994634260480/STEM/7ac423a9960b4cfc89f3dfff0e2c0617.png)
(1)若
![](https://img.xkw.com/dksih/QBM/2016/9/5/1572994627854336/1572994634260480/STEM/32da3ad1210e409d949bd8c5de8ab84b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)在
![](https://img.xkw.com/dksih/QBM/2016/9/5/1572994627854336/1572994634260480/STEM/4342a0ab72484c1aa017103a09453653.png)
![](https://img.xkw.com/dksih/QBM/2016/9/5/1572994627854336/1572994634260480/STEM/c8c6545fd3364b64a3783119404c785b.png)
![](https://img.xkw.com/dksih/QBM/2016/9/5/1572994627854336/1572994634260480/STEM/35c1cfc7bf4e4d2aa008c79a2453f3e7.png)
![](https://img.xkw.com/dksih/QBM/2016/9/5/1572994627854336/1572994634260480/STEM/c711092c86f64a96bd8dc66156749261.png)
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9 . 选修4-1:几何证明选讲
已知如图,四边形
是圆
的内接四边形,对角线
交于点
,直线
是圆
的切线,切
点为
,
.
(1)若
,求
的长;
(2)在
上取一点
,若
,求
的大小.
已知如图,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac07c8a89cc64fde478fff9da45b7ad.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f24baa0e5971b5e3e41477c183b56e8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7341a01a2aa0d2d565e5abba6a5e76d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c028c1617dbdbe72d6e78096b9d17221.png)
![](https://img.xkw.com/dksih/QBM/2016/8/29/1572993616281600/1572993622712320/STEM/78d2b6074e4e4c7ba8f4055a6dbc5df6.png)
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10 . 选修4-1:几何证明选讲
如图,已知
是
的外角
的平分线,交
的延长线于点
,延长
交
的外接
圆于点
,连结
.
![](https://img.xkw.com/dksih/QBM/2016/8/24/1572992052699136/1572992059105280/STEM/faa8b2cb2dfb439d87c61ccb345abf2d.png)
(1)求证:
;
(2)若
,求
的长.
如图,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6344778ed1e75c1a99e2268468081867.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/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
圆于点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa175408eddbdfddfbe9701646d62b92.png)
![](https://img.xkw.com/dksih/QBM/2016/8/24/1572992052699136/1572992059105280/STEM/faa8b2cb2dfb439d87c61ccb345abf2d.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c07b92b8282c7fd1158b3b5098e38c39.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ddfcdeed612c9976ecaca2d2b63d14d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
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