如图所示,
是
的直径,
为
延长线上的一点,
是
的割线,过点
作
的垂线,分别交
延长线于点
,过点
作
的切线,切点为
.
(1)证明:
四点共圆;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/02760ff3f69823422236f73890e484d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/97bde5efa645a4c1ed6874088400d6a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50d6e29d79a1bd34722833d4c059644f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f900d8744217015f808d935656c2857b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421e73b36f0e1d4741d9dfc331b8a827.png)
![](https://img.xkw.com/dksih/QBM/2012/3/7/1570790532071424/1570790538108928/STEM/63190e7c46ec474c9057d98ba6603333.png?resizew=157)
11-12高三上·湖北·期中 查看更多[1]
(已下线)2011—2012学年度湖北省华中师大一附中上学期高三期中检测理科数学试卷
更新时间:2016-12-01 16:44:26
|
【知识点】 几何证明选讲
相似题推荐
解答题-证明题
|
较易
(0.85)
【推荐1】选修4—1:平面几何证明选讲
如图,
、
切⊙
于
、
,
为⊙
的割线.
![](https://img.xkw.com/dksih/QBM/2016/8/11/1572974317051904/1572974323195904/STEM/100aab0bd136499595a9fe2b7caba600.png)
(1)求证:
;
(2)已知
,
,求
与
的比值.
如图,
![](https://img.xkw.com/dksih/QBM/2016/8/11/1572974317051904/1572974323195904/STEM/a8e5922618744349a1c6711636c60695.png)
![](https://img.xkw.com/dksih/QBM/2016/8/11/1572974317051904/1572974323195904/STEM/0a3abd75222d4d7da6179f8c354751b4.png)
![](https://img.xkw.com/dksih/QBM/2016/8/11/1572974317051904/1572974323195904/STEM/93013b2d71664ede944cbcd7119d2e3f.png)
![](https://img.xkw.com/dksih/QBM/2016/8/11/1572974317051904/1572974323195904/STEM/31ca652beda2453bace6c9ac7d477755.png)
![](https://img.xkw.com/dksih/QBM/2016/8/11/1572974317051904/1572974323195904/STEM/21c22dc6afcf453e82d97cdd73e23f63.png)
![](https://img.xkw.com/dksih/QBM/2016/8/11/1572974317051904/1572974323195904/STEM/a9925828f2d946bab44f4f8bbad91e01.png)
![](https://img.xkw.com/dksih/QBM/2016/8/11/1572974317051904/1572974323195904/STEM/93013b2d71664ede944cbcd7119d2e3f.png)
![](https://img.xkw.com/dksih/QBM/2016/8/11/1572974317051904/1572974323195904/STEM/100aab0bd136499595a9fe2b7caba600.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/8/11/1572974317051904/1572974323195904/STEM/289f9a195b0a4bf7ae92db962a81984d.png)
(2)已知
![](https://img.xkw.com/dksih/QBM/2016/8/11/1572974317051904/1572974323195904/STEM/8b1a3db615e14d1da7ee2f37102d2cf9.png)
![](https://img.xkw.com/dksih/QBM/2016/8/11/1572974317051904/1572974323195904/STEM/58ae5e276a4e4f3a91ed49d15a6c1027.png)
![](https://img.xkw.com/dksih/QBM/2016/8/11/1572974317051904/1572974323195904/STEM/0d303aa4bee2493e8cd189ff55c1f467.png)
![](https://img.xkw.com/dksih/QBM/2016/8/11/1572974317051904/1572974323195904/STEM/43b1018ae6e64e18961f21ddd3f45696.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐2】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