从⊙
外一点
引圆的两条切线
,
及一条割线
,
、
为切点.求证:
.
![](https://img.xkw.com/dksih/QBM/2010/9/29/1569843378266112/1569843383582720/STEM/fab86f5c70bf42ed9320057aa54a2bd4.png)
![](https://img.xkw.com/dksih/QBM/2010/9/29/1569843378266112/1569843383582720/STEM/05a52fc8f2e94657aa4fa9a1672e70b6.png)
![](https://img.xkw.com/dksih/QBM/2010/9/29/1569843378266112/1569843383582720/STEM/f35d0dcfe6814d2dadedbd8f01a7c771.png)
![](https://img.xkw.com/dksih/QBM/2010/9/29/1569843378266112/1569843383582720/STEM/a067d109aa41425c9468bbda6d2b8c88.png)
![](https://img.xkw.com/dksih/QBM/2010/9/29/1569843378266112/1569843383582720/STEM/fd029dc29a1b40598009b1c639764d2a.png)
![](https://img.xkw.com/dksih/QBM/2010/9/29/1569843378266112/1569843383582720/STEM/9d8b9c4996e340ab984b0fb3c36c0768.png)
![](https://img.xkw.com/dksih/QBM/2010/9/29/1569843378266112/1569843383582720/STEM/86d7dd2eadf94a1989861f27f22dd530.png)
![](https://img.xkw.com/dksih/QBM/2010/9/29/1569843378266112/1569843383582720/STEM/ff9a245795b94171b7d58dee6edb4e9d.png)
![](https://img.xkw.com/dksih/QBM/2010/9/29/1569843378266112/1569843383582720/STEM/0dfe567edca74359bdca09884e0b0a64.png)
2013·辽宁沈阳·一模 查看更多[1]
(已下线)2013届辽宁沈阳二中等重点中学协作体高三领航高考预测(二)文数学卷
更新时间:2016-12-02 05:20:10
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【知识点】 几何证明选讲
相似题推荐
解答题-证明题
|
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(0.85)
名校
【推荐1】选修4—1,几何证明选讲
如图所示,圆
的两弦
和
交于点
,
∥
,
交
的延长线于点
,
切圆
于点
.
(1)求证:△
∽△
;
(2)如果
,求
的长.
如图所示,圆
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/5639eeaf-f09e-4d54-803c-038e6a4210ed.png?resizew=126)
(1)求证:△
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a38a6341dbb03ec2c0c10e5353a07c7a.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a917db13b0c7bb4a4f81c81a970454c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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解答题-问答题
|
较易
(0.85)
【推荐2】选修4-1:几何证明选讲
如图,
与圆
相切于点
,
为圆
上两点,延长
交圆
于点
,
且交
于点
.
![](https://img.xkw.com/dksih/QBM/2016/8/24/1572989355376640/1572989361668096/STEM/a78550ab55594c369e773783426d1590.png)
(1)证明:
∽
;
(2)若
为圆
的直径,
,
,求
.
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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/094d11233794245d95ba79128ea3c4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2016/8/24/1572989355376640/1572989361668096/STEM/a78550ab55594c369e773783426d1590.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb2dec12644272733ffdd9031aad1d37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/705712479f3f5d26ce080b71230984cf.png)
(2)若
![](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/47acc08846fd9657acec59f221be23be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faffe3765c15f53305516895aa595a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b662e49246aba79e1536ffec3197f8c.png)
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