选修4-1:几何证明选讲
如图,△
内接于直径为
的圆
,过点
作圆
的切线交
的延长线于点
,
的角平分线
交
和圆
于点
、
,且
.
![](https://img.xkw.com/dksih/QBM/2016/11/3/1573112564113408/1573112570527744/STEM/c8f0b84bd906475e97b50fc1f27d1619.png)
(1)求
的比值;
(2)求
的值.
如图,△
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c27f7309808e0c517168a2291cceee3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f4890d3720c98cdfbfbcb95b0617fac.png)
![](https://img.xkw.com/dksih/QBM/2016/11/3/1573112564113408/1573112570527744/STEM/c8f0b84bd906475e97b50fc1f27d1619.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/746853ea6d76bd7cccc6bdd6c739aed7.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47050d71aa1c86a620646c6860a96e90.png)
更新时间:2016-12-04 23:28:37
|
【知识点】 几何证明选讲
相似题推荐
解答题-证明题
|
较易
(0.85)
【推荐1】如图所示,在等腰三角形
中,
,
为
延长线上一点,
为
延长线上一点,且满足
.
![](https://img.xkw.com/dksih/QBM/2017/1/25/1619472519102464/1619472519610368/STEM/fe4c6a8cbbaf490ca3b26ee8b5f79614.png)
(1)求证:
∽
;
(2)若
,求
的读数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a840d22a45b6f994cf2dbdddd5e1abc.png)
![](https://img.xkw.com/dksih/QBM/2017/1/25/1619472519102464/1619472519610368/STEM/fe4c6a8cbbaf490ca3b26ee8b5f79614.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504388564cf808feff52c16bae297a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aad7be678f22aed46fbd0465379fb9e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10ad623f3a05ecdc27b3f3e0169669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐2】如图,已知AB是⊙O的直径,CD是⊙O的切线,C为切点,连接AC,过点A作AD⊥CD于点D,交⊙O于点E.
![](https://img.xkw.com/dksih/QBM/2015/3/27/1572039932092416/1572039938056192/STEM/6ce110d87a8941e39283869eb7a414c1.png)
(Ⅰ)证明:∠AOC=2∠ACD;(Ⅱ)证明:AB•CD=AC•CE.
![](https://img.xkw.com/dksih/QBM/2015/3/27/1572039932092416/1572039938056192/STEM/6ce110d87a8941e39283869eb7a414c1.png)
(Ⅰ)证明:∠AOC=2∠ACD;(Ⅱ)证明:AB•CD=AC•CE.
您最近一年使用:0次