如图,A,B,C,D四点在同一圆上,
与
的延长线交于点
,点
在
的延长线上.
![](https://img.xkw.com/dksih/QBM/2014/10/29/1571885855260672/1571885860954112/STEM/dbe84fa9a7234eecb3542d045f576190.png)
(1)若
,求
的值;
(2)若
,证明:
.
![](https://img.xkw.com/dksih/QBM/2014/10/29/1571885855260672/1571885860954112/STEM/3959f0469da944df9869dc3fc5c0c0f0.png)
![](https://img.xkw.com/dksih/QBM/2014/10/29/1571885855260672/1571885860954112/STEM/e0bea0a27c90469b8eac6942c0c7301a.png)
![](https://img.xkw.com/dksih/QBM/2014/10/29/1571885855260672/1571885860954112/STEM/b6dc0f1e71d74eb9a6a9f2bf2884d5eb.png)
![](https://img.xkw.com/dksih/QBM/2014/10/29/1571885855260672/1571885860954112/STEM/5ce69915a36b4da19860d4b41c0ad358.png)
![](https://img.xkw.com/dksih/QBM/2014/10/29/1571885855260672/1571885860954112/STEM/2a007b253c644618b8bbe16c5741a2b9.png)
![](https://img.xkw.com/dksih/QBM/2014/10/29/1571885855260672/1571885860954112/STEM/dbe84fa9a7234eecb3542d045f576190.png)
(1)若
![](https://img.xkw.com/dksih/QBM/2014/10/29/1571885855260672/1571885860954112/STEM/065225e99266493081e4c369273fc8e5.png)
![](https://img.xkw.com/dksih/QBM/2014/10/29/1571885855260672/1571885860954112/STEM/785220f916254bce9c3c65e2bd7be08d.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2014/10/29/1571885855260672/1571885860954112/STEM/74858fd5b2314c268aff8a3a49676f3b.png)
![](https://img.xkw.com/dksih/QBM/2014/10/29/1571885855260672/1571885860954112/STEM/995d49f3b9b74862b7817e5b93a1ef3b.png)
2012·宁夏银川·一模 查看更多[3]
更新时间:2016-12-03 05:52:52
|
【知识点】 几何证明选讲
相似题推荐
解答题-证明题
|
较易
(0.85)
名校
【推荐1】如图,四边形
内接于圆
,弧
与弧
长度相等,过
点的切线交
的延长线于
点.求证:
.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce9a5842125844c78436fde416e2145.png)
![](https://img.xkw.com/dksih/QBM/2020/3/31/2431484853633024/2432207860449280/STEM/d7e7dc31b05d401aa392788f605f29c9.png?resizew=129)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐2】在
中,
,过点
的直线与其外接圆交于点
,交
延长线于点
.
![](https://img.xkw.com/dksih/QBM/2011/4/20/1570124972236800/1570124977684480/STEM/a6929cd0a7f340d086fbfabc5495dc7d.png?resizew=216)
(1)求证:
;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2011/4/20/1570124972236800/1570124977684480/STEM/a6929cd0a7f340d086fbfabc5495dc7d.png?resizew=216)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/899408580730ada2e8d9f8809bb1496f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b17ce2318447b226bfe6c8f0fb60a8ed.png)
您最近一年使用:0次