如图,在⊙O中,点P为直径BA延长线上一点,直线PD切⊙O于点D,过点B作BH⊥PD,垂足为H,BH交⊙O于点C,连接BD.
![](https://img.xkw.com/dksih/QBM/2016/10/6/1578976699621376/1578976700203008/STEM/229f242f82aa4ddbba354fa389283b31.png)
(1)求证:BD平分∠ABH;
(2)如果AB=10,BC=6,求BD的长;
(3)在(2)的条件下,当E是弧AB的中点,DE交AB于点F,求DE·DF的值.
![](https://img.xkw.com/dksih/QBM/2016/10/6/1578976699621376/1578976700203008/STEM/229f242f82aa4ddbba354fa389283b31.png)
(1)求证:BD平分∠ABH;
(2)如果AB=10,BC=6,求BD的长;
(3)在(2)的条件下,当E是弧AB的中点,DE交AB于点F,求DE·DF的值.
更新时间:2016-12-13 06:19:13
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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
已知
中,
,
是
外接圆劣弧
上的点(不与点
重合),延长
至
.
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259720044544/STEM/ca7c9f1eba984f43b090bde0c719b009.png)
(1)求证:
的延长线平分
;![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259720044544/STEM/06c491c03b0f49609e9d7d7401a68373.png)
(2)若
,
中
边上的高为
,求
外接圆的面积.
已知
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259720044544/STEM/0a58e72a94644f998218b7755acc2c88.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259720044544/STEM/483e809e65974e77be09e1e919905dc5.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259720044544/STEM/9346b12ddd924a4486743a15408c3b3b.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259720044544/STEM/0a58e72a94644f998218b7755acc2c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e262f59351803e420bf1226c95e4bba.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259720044544/STEM/a5ef4637d85345eb9e6570e36da3984b.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259720044544/STEM/a367de41f75d4f4bbe675332f176ed87.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259720044544/STEM/cb1f86387576439984959b18c31ff022.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259720044544/STEM/ca7c9f1eba984f43b090bde0c719b009.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259720044544/STEM/022bed09e2314d76b23bde3f6fc6edeb.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259720044544/STEM/a8f9c09b4e8d49fca218e52fa0b8555a.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259720044544/STEM/06c491c03b0f49609e9d7d7401a68373.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259720044544/STEM/dfa31be112d44893a57c9857bedf409a.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259720044544/STEM/0a58e72a94644f998218b7755acc2c88.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259720044544/STEM/bef4bd2629c1475ba6ea189aa0dccca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16edecab3862a10bc9480543c34478a9.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259713720320/1572259720044544/STEM/0a58e72a94644f998218b7755acc2c88.png)
您最近一年使用:0次
解答题
|
适中
(0.64)
【推荐2】如图,
是
的一条切线,切点为
和
都是
的割线,
.
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572959041642496/1572959047884800/STEM/9e9bab8eb07245379fc32b764f682bfd.png)
(1)证明:
;
(2)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572959041642496/1572959047884800/STEM/fe907a13c78f4df2b148264b347f53c4.png)
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572959041642496/1572959047884800/STEM/9486e164e97c42ba9b11d76488b2dc0d.png)
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572959041642496/1572959047884800/STEM/70f2130fe3e44473bf8748e5f5c32c3b.png)
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572959041642496/1572959047884800/STEM/fe907a13c78f4df2b148264b347f53c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/625b4c2492d39e4f369cb5e724b00af1.png)
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572959041642496/1572959047884800/STEM/9e9bab8eb07245379fc32b764f682bfd.png)
(1)证明:
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572959041642496/1572959047884800/STEM/96b71fce156143ea8d4a1bb55c16136f.png)
(2)证明:
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572959041642496/1572959047884800/STEM/0c69a9250af54dcb8e09d6ae3a52a9b7.png)
您最近一年使用:0次