选做题(10分.请考生必须在22、23题中任选一题做答,如果多做,则按所做的第一题记分)
22.
选修4-1:几何证明选讲
在△ABC中,AB=AC,过点A的直线与其外接圆交于点P,交BC延长线于点D.
(Ⅰ)求证:
;
(Ⅱ)若AC=2,求AP•AD的值.
22.
选修4-1:几何证明选讲
在△ABC中,AB=AC,过点A的直线与其外接圆交于点P,交BC延长线于点D.
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f44caa95b907ab06f85da6f52b9213.png)
(Ⅱ)若AC=2,求AP•AD的值.
![](https://img.xkw.com/dksih/QBM/2011/3/9/1570032299630592/1570032305381376/STEM/fd92e888cb9043e0bcd8d3422ae0a244.png?resizew=216)
2011·山西·一模 查看更多[1]
(已下线)2011届山西大学附中高三第二学期高三第一次模拟测试数学试卷
更新时间:2016-11-30 15:01:48
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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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较易
(0.85)
【推荐1】如图,△ABC内接于圆O,分别取AB、AC的中点D、E,连接DE,直线DE交圆O在B点处的切线于G,交圆于H、F两点,若GD=4,DE=2,DF=4.
![](https://img.xkw.com/dksih/QBM/2016/7/8/1572898373492736/1572898379440128/STEM/b155326795bd4d568ee7b0e0e4c5bc4c.png)
(Ⅰ) 求证:
=
;
(Ⅱ)求HD的长.
![](https://img.xkw.com/dksih/QBM/2016/7/8/1572898373492736/1572898379440128/STEM/b155326795bd4d568ee7b0e0e4c5bc4c.png)
(Ⅰ) 求证:
![](https://img.xkw.com/dksih/QBM/2016/7/8/1572898373492736/1572898379440128/STEM/fc4320e5d940427d80bdf43241c92281.png)
![](https://img.xkw.com/dksih/QBM/2016/7/8/1572898373492736/1572898379440128/STEM/447b2961b2c245008443f2878fc280ad.png)
(Ⅱ)求HD的长.
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解答题-证明题
|
较易
(0.85)
【推荐2】如图,
的两条中线
和
相交于点
,且
四点共圆.
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572875430617088/1572875437137920/STEM/491ec1fecc7a40a0bf3932e98d73780d.png)
(Ⅰ)求证:
;
(Ⅱ) 若
,求
.
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572875430617088/1572875437137920/STEM/13eeac5f6fcf4fcfb6614f79efea95f4.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572875430617088/1572875437137920/STEM/a05ddabf1c6f46af9323c3cfd9d0dced.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572875430617088/1572875437137920/STEM/d724570a7ac5421e9382f466d075fb61.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572875430617088/1572875437137920/STEM/f725d6f972e344b7955b262aed8349a1.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572875430617088/1572875437137920/STEM/1cb3ff4a8a4c424091a4427391637946.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572875430617088/1572875437137920/STEM/491ec1fecc7a40a0bf3932e98d73780d.png)
(Ⅰ)求证:
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572875430617088/1572875437137920/STEM/9cf537152b414c828269a235e615d425.png)
(Ⅱ) 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/387d5b3f46220306aa2ce166f0394b99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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