如图.点P为⊙O外一点.过点P作⊙O的切线PA、PB.点A、B为切点.连接AO并延长交PB的延长线于点C.过点C作CD⊥PO.交PO的延长线于点D.已知PA=6.AC=8.则CD的长为 _____ .
![](https://img.xkw.com/dksih/QBM/2022/4/16/2959391584788480/2959544362991616/STEM/7c73c4a8-c85e-4542-900e-8e0c3f679406.png?resizew=153)
更新时间:2022-04-16 19:11:19
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【推荐1】在平面直角坐标系中,O是坐标原点,A、B两点的坐标分别为
、
,则
的内心与外心之间的距离是__________ .
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【推荐2】如图,PA、PB是⊙O的切线,切点分别为A、B,BC是⊙O的直径,PO交⊙O于E点,连接AB交PO于F,连接CE交AB于D点.下列结论:①PA=PB;②OP⊥AB;③CE平分∠ACB;④OF=
AC;⑤E是△PAB的内心;⑥△CDA≌△EDF.其中一定成立的是(只填序号) ________ .
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【推荐1】如图,在
中,
,
,
,点
在边
上,并且
,点
为边
上的动点,将
沿直线
翻折,点
落在点
处,则点
到边
距离的最小值是________ .
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【推荐2】如图1,在四边形
中,
,动点P,Q同时从点A出发,点P以
的速度沿
向点B运动(运动到B点即停止),点Q以
的速度沿折线
向终点C运动,设点Q的运动时间为
,
的面积为
,若y与x之间的函数关系的图像如图2所示,当
时,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070d1ea22a92808dad7489438c239629.png)
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