1 . 如图,△ABC内接于直径为BC的圆O,过点作圆O的切线交CB的延长线于点P ,AE交BC和圆O于点D、E,且
,若PA=2PB=10.
![](https://img.xkw.com/dksih/QBM/2016/9/21/1573035383857152/1573035389886464/STEM/f1e1126f2f10491e8e93805c313b3419.png)
(Ⅰ)求证:AC=2AB;
(Ⅱ)求AD•DE的值.
![](https://img.xkw.com/dksih/QBM/2016/9/21/1573035383857152/1573035389886464/STEM/18a34e4c9d514173b3b765542cfcc65e.png)
![](https://img.xkw.com/dksih/QBM/2016/9/21/1573035383857152/1573035389886464/STEM/f1e1126f2f10491e8e93805c313b3419.png)
(Ⅰ)求证:AC=2AB;
(Ⅱ)求AD•DE的值.
您最近一年使用:0次
2 . 如图,P是⊙O的直径AB延长线上一点,PC与⊙O相切于点C.∠APC的角平分线交AC于点Q,则∠AQP的大小为 __________ .
![](https://img.xkw.com/dksih/QBM/2016/9/21/1573035383857152/1573035389788160/STEM/842209acb721464389e8ab4fab147fc2.png?resizew=128)
您最近一年使用:0次