It's said that he's____ by plane.
四个角分别相等,四条边分别相等的两个四边形称为全等四边形.已知在四边形ABCD和四边形A′B′C′D′中,AB=A′B′,BC=B′C′,CD=C′D′.要使四边形ABCD≌四边形A′B′C′D′,可以添加的条件是( )