已知△
内接于⊙
,
为⊙
的切线,
为直线
上一点,过点
作
的平行线交直线
于点
,交直线
于点
.
![](https://img.xkw.com/dksih/QBM/2012/2/16/1570743170301952/1570743176052736/STEM/9d1f0badb2d44529a5cbed434b198e61.png?resizew=248)
(Ⅰ)如图甲,求证:当点
在线段
上时,
;
(Ⅱ)如图乙,当点
在线段
的延长线上时,(Ⅰ)的结论是否仍成立?如果成立,请给予证明;如果不成立,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7bf58e5fea1189b33cf55d86335452f.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/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/2012/2/16/1570743170301952/1570743176052736/STEM/9d1f0badb2d44529a5cbed434b198e61.png?resizew=248)
(Ⅰ)如图甲,求证:当点
![](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/10ec004a08fa1e44677983a09cac00d1.png)
(Ⅱ)如图乙,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
12-13高三上·海南省直辖县级单位·期末 查看更多[1]
(已下线)2012届海南省琼海市嘉积中学高三第一学期期末理科数学试卷
更新时间:2016-12-01 15:08:05
|
【知识点】 几何证明选讲
相似题推荐
解答题-问答题
|
适中
(0.64)
【推荐1】选修4-1:几何证明选讲
如图,
切圆
于点
,直线
交圆
于
两点,
,垂足为
.
![](https://img.xkw.com/dksih/QBM/2016/6/22/1572787387006976/1572787393445888/STEM/9599c56d4f2b4e22956f984f1a401b23.png)
(1)证明:
;
(2)若
,求圆
的直径.
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71deef18df0a35ef131b5653aa0b0202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2016/6/22/1572787387006976/1572787393445888/STEM/9599c56d4f2b4e22956f984f1a401b23.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/174a0e72f870185f91bd78c85b86c916.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd1bf599d552b188147e008a05b7d08a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.64)
【推荐2】如图,AB是圆O的直径,D,E为圆上位于AB异侧的两点,连接BD并延长至点C,使BD=DC,连接AC,AE,DE.
![](https://img.xkw.com/dksih/QBM/2014/3/24/1571574124314624/1571574129598464/STEM/a876496a52ba4637b9b5cae2771f903d.png)
求证:∠E=∠C.
![](https://img.xkw.com/dksih/QBM/2014/3/24/1571574124314624/1571574129598464/STEM/a876496a52ba4637b9b5cae2771f903d.png)
求证:∠E=∠C.
您最近一年使用:0次