1 . 选修4-1:几何证明选讲
如图,
是圆
的直径,
是圆内接四边形,
于点
,且
与圆
相切于点
.
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573018779394048/1573018785505280/STEM/101a2ed377a0413888a894678a05d66f.png)
(1)求证:
平分
;
(2)若
,求
的长.
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259c150cffdc68e8ba79848110cf7d57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/2016/9/13/1573018779394048/1573018785505280/STEM/101a2ed377a0413888a894678a05d66f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a89a98486b422ac7c9e4d977d6817b26.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4b971966a4483b0c2a56279e34a78fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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2016-12-04更新
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2卷引用:2017届江西新余一中高三上学期开学考试数学(理)试卷