【选修4-1:几何证明选讲】
如图,已知圆上的弧
,过点
的圆的切线
与
的延长线交于
点.
![](https://img.xkw.com/dksih/QBM/2015/12/22/1572379801321472/1572379807793152/STEM/29a338a4b03445b8af5ca50d6467db10.png)
求证:(1)
;
(2)
.
如图,已知圆上的弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d153474afe208d90cc904f77f4579379.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca66a268d6f46e0e9d5d9151b785be60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec5402fd66f25b025c2f89c0897354d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bc0983721388501807b32c17ca08281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ebbd866e455cf80ea669c9f56f792c.png)
![](https://img.xkw.com/dksih/QBM/2015/12/22/1572379801321472/1572379807793152/STEM/29a338a4b03445b8af5ca50d6467db10.png)
求证:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cccd81670438fe95436683b38680eda.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c0f10c558c9651092742fc29c953f38.png)
更新时间:2016-12-03 21:55:07
|
【知识点】 几何证明选讲
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,已知
中,
,以
为直径的圆
交
于点
,过
作
,垂足为
,连结
,若
,分别求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9178fc8b5d65aa75fa9196294a0db7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c029f2663b3fd557c9169e295c353e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6402a3bb6be38f5bfafacc86c7bd008.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598c4ff9fc8518fa4829e39254d3f6e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43940e08de28036e82a5d34e267962be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7751200fb5213e9e6856ffa88998d4c7.png)
![](https://img.xkw.com/dksih/QBM/2012/4/27/1570845351174144/null/STEM/935ed23dd57a429883bf2d3bfbe5af0a.png?resizew=194)
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解答题
|
适中
(0.64)
【推荐2】选修4-1:几何证明选讲
如图,四边形
是圆
的内接四边形,
是圆
的直径,
,
的延长线与
的延长线交于点
,过
作
,垂足为点
.
![](https://img.xkw.com/dksih/QBM/2016/8/18/1572984524709888/1572984530763776/STEM/5e7197db4ae046b090c41f3b9fe2d5ce.png)
(1)证明:
是圆
的切线;
(2)若
,求
的长.
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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a16dc02090b6e9263555061f14fbc8c.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb0da3fe110516ccf293ef585411a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2016/8/18/1572984524709888/1572984530763776/STEM/5e7197db4ae046b090c41f3b9fe2d5ce.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/521041288c4c4eb8ea5049debb2f371c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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