Can diagonals form vertically opposite angles in a rectangle ?

No, diagonals in a rectangle cannot form vertically opposite angles. In a rectangle, the diagonals bisect each other and form four right angles at their point of intersection. Vertically opposite angles are formed when two lines intersect and create opposite angles that are equal in measure. Since the diagonals of a rectangle do not intersect in a way that creates vertically opposite angles, it is not possible for diagonals to form vertically opposite angles in a rectangle.