如图,D,E分别是AB,AC边上的点,且不与顶点重合,已知
,
为方程
的两根,
(1) 证明
四点共圆;
(2) 若
,求
四点所在圆的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b662797f6678e2475f4631563694e37a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea77ba313fcc751481ac1ca214df3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6ed516191ef7d1805cd7cf945232d79.png)
(1) 证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b226772d996dafd09c37b5bad17d54fd.png)
(2) 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96f402d5cb7a7d2ea738391f39a00897.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b226772d996dafd09c37b5bad17d54fd.png)
![](https://img.xkw.com/dksih/QBM/2012/2/15/1570738702614528/1570738707406848/STEM/bd53a0f954f849d9b5e078e4efc9698f.png?resizew=150)
12-13高三上·辽宁本溪·期末 查看更多[1]
(已下线)2012届辽宁省本溪一中、庄河高中高三上学期期末文科数学
更新时间:2016-12-01 14:58:59
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【知识点】 几何证明选讲
相似题推荐
解答题-证明题
|
适中
(0.64)
【推荐1】选修4—1:几何证明选讲
如图,在正
中,点
分别在边
上,且
,
,
与
交于点
.
(1)求证:
四点共圆;
(2)若正
的边长为2,求点
所在圆的半径.
如图,在正
![](https://img.xkw.com/dksih/QBM/2015/5/27/1572114560376832/1572114566799360/STEM/05bbc2f9468845978ab72c1e191a446f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5881068127a39caf319492b4177204f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28acde0aef5f9ae10dd54279daf9ba56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aee316a7843afbe76506612f597bf71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fb6028ada3b44e15f9a3f3462da67c3.png)
(2)若正
![](https://img.xkw.com/dksih/QBM/2015/5/27/1572114560376832/1572114566799360/STEM/05bbc2f9468845978ab72c1e191a446f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fb6028ada3b44e15f9a3f3462da67c3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/13/3a38368a-199a-4d56-9527-3886de71abf9.png?resizew=188)
您最近一年使用:0次
解答题-证明题
|
适中
(0.64)
【推荐2】(选修4-1:几何证明选讲)
如图,
的直径,
延长线上的一点,
的割线,过点
作
的垂线,交直线
,交直线
,过点
作
的切线,切点为![](https://img.xkw.com/dksih/QBM/2016/3/18/1572545467555840/1572545473904640/STEM/a87b97056abd42509c45877c5f48c039.png)
![](https://img.xkw.com/dksih/QBM/2016/3/18/1572545467555840/1572545473904640/STEM/bec88c9465b94abfb0e7f745306f2fb6.png)
(1)求证:
四点共圆;
(2)若
.
如图,
![](https://img.xkw.com/dksih/QBM/2016/3/18/1572545467555840/1572545473904640/STEM/c6b4903b30f6464dabb9e900a7bf9dea.png)
![](https://img.xkw.com/dksih/QBM/2016/3/18/1572545467555840/1572545473904640/STEM/b8d499cf41a34eb1977411de67aec4ef.png)
![](https://img.xkw.com/dksih/QBM/2016/3/18/1572545467555840/1572545473904640/STEM/2bd2677f1dc14192afeab5b612ab4084.png)
![](https://img.xkw.com/dksih/QBM/2016/3/18/1572545467555840/1572545473904640/STEM/fdbc34b6d9a44ec08c9db6e4021ca74e.png)
![](https://img.xkw.com/dksih/QBM/2016/3/18/1572545467555840/1572545473904640/STEM/0b1451103dae4892bf711520c55252d5.png)
![](https://img.xkw.com/dksih/QBM/2016/3/18/1572545467555840/1572545473904640/STEM/70c60167bcce4341a98ea697b18997de.png)
![](https://img.xkw.com/dksih/QBM/2016/3/18/1572545467555840/1572545473904640/STEM/b8c99e69104148ab8e17058aaf0768fa.png)
![](https://img.xkw.com/dksih/QBM/2016/3/18/1572545467555840/1572545473904640/STEM/fdbc34b6d9a44ec08c9db6e4021ca74e.png)
![](https://img.xkw.com/dksih/QBM/2016/3/18/1572545467555840/1572545473904640/STEM/2288deeb8589424d946ca325bc110f1d.png)
![](https://img.xkw.com/dksih/QBM/2016/3/18/1572545467555840/1572545473904640/STEM/a87b97056abd42509c45877c5f48c039.png)
![](https://img.xkw.com/dksih/QBM/2016/3/18/1572545467555840/1572545473904640/STEM/bec88c9465b94abfb0e7f745306f2fb6.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/3/18/1572545467555840/1572545473904640/STEM/72517459eb26467cb262d1de5e2e8f67.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2016/3/18/1572545467555840/1572545473904640/STEM/4b75c282740344fc880ddc1b875392e4.png)
您最近一年使用:0次