A:had managed
B:would manage
C:have managed
D:managed
如图,已知菱形ABCD的对角线AC 、BD相交于点O,延长AB至点E,使BE=AB,连接CE.
如图,点E在正方形ABCD的边CD上,把△ADE绕点A顺时针旋转90°至△ABF位置,如果AB= 3 ,∠EAD=30°,那么点E与点F之间的距离等于____.