如图,在梯形ABCD中,AD∥EF∥BC,BE=3AE,AD=3,EF=4,则BC=____.
- Have you seen the film Dad, where are we going?
- Yes. It's interesting one.
如图,正方形OABC与正方形ODEF是位似图形,O为位似中心,相似比为1:2,点A的坐标为(1,0),则E点的坐标为( )