A:
B:
C:
D:
如图,已知AB是⊙O的直径,点P在BA的延长线上,PD切⊙O于点D,过点B作BE垂直于PD,交PD的延长线于点C,连接AD并延长,交BE于点E.
(1)求证:AB=BE;
(2)若PA=2,cosB=35,求⊙O半径的长.
读“经纬网图”,回答问题。
— Sorry, I didn't pass the exam, and then what should I do?
—I think perhaps you should be careful next time.
在平面直角坐标系内,一束光线从点A(-3,5)出发,被x轴反射后到达点B(2,7),则这束光线从A到B所经过的距离为( )。