1 . 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
2 . 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
3 . 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
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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