(年贵州遵义12分)如图,直角梯形ABCD中,AB∥CD,∠DAB=90°,且∠ABC=60°,AB=BC,△ACD的外接圆⊙O交BC于E点,连接DE并延长,交AC于P点,交AB延长线于F.
(1)求证:CF=DB;
(2)当AD=时,试求E点到CF的距离.
(年贵州遵义12分)如图,直角梯形ABCD中,AB∥CD,∠DAB=90°,且∠ABC=60°,AB=BC,△ACD的外接圆⊙O交BC于E点,连接DE并延长,交AC于P点,交AB延长线于F.
(1)求证:CF=DB;
(2)当AD=时,试求E点到CF的距离.