AB是圆O的直径,弦CD垂直AB于H,点E在BC上,且弧CE=弧AD,AE与CD交于点G,与BC交于点F
前两问分别得出BF/BC=EF/DH,OG平行于BC
第三问过D作圆O切线,交BA延长线于P,M是圆O上的动点,AE=8,AH=2,求HM/PM的定值或者变化规律
初三党,以前做过一次 好像是要证明一对相似三角形 百度不到![](http://static.tieba.baidu.com/tb/editor/images/bjq/image_editoricon33.png)
![](http://static.tieba.baidu.com/tb/editor/images/bjq/image_editoricon28.png)
![](http://imgsrc.baidu.com/forum/w%3D580/sign=7cb6f76dfe039245a1b5e107b795a4a8/cca6d0a20cf431ad749742994936acaf2fdd98de.jpg)
![](http://imgsrc.baidu.com/forum/w%3D580/sign=0385c8939045d688a302b2ac94c37dab/aeb30cf431adcbefb6717fa6aeaf2edda2cc9fde.jpg)
![](http://imgsrc.baidu.com/forum/w%3D580/sign=3d7ba6d5d488d43ff0a991fa4d1fd2aa/72e531adcbef76098a4e983f2cdda3cc7dd99ede.jpg)
前两问分别得出BF/BC=EF/DH,OG平行于BC
第三问过D作圆O切线,交BA延长线于P,M是圆O上的动点,AE=8,AH=2,求HM/PM的定值或者变化规律
初三党,以前做过一次 好像是要证明一对相似三角形 百度不到
![](http://static.tieba.baidu.com/tb/editor/images/bjq/image_editoricon33.png)
![](http://static.tieba.baidu.com/tb/editor/images/bjq/image_editoricon28.png)
![](http://imgsrc.baidu.com/forum/w%3D580/sign=7cb6f76dfe039245a1b5e107b795a4a8/cca6d0a20cf431ad749742994936acaf2fdd98de.jpg)
![](http://imgsrc.baidu.com/forum/w%3D580/sign=0385c8939045d688a302b2ac94c37dab/aeb30cf431adcbefb6717fa6aeaf2edda2cc9fde.jpg)
![](http://imgsrc.baidu.com/forum/w%3D580/sign=3d7ba6d5d488d43ff0a991fa4d1fd2aa/72e531adcbef76098a4e983f2cdda3cc7dd99ede.jpg)