Questions 1, 4 and 5 by Gavin Lim

5)If both e and f are midpoints, there is the same distance from AE and FC so BE and FD are parallel, which makes BEFD a parallelogram.

4)No. The sides of a square must all be perpendicular to each other while the sides of a parallelogram may not be perpendicular.

1) A square is a rhombus as it has 2 pairs of parallel lines of equal length but a rhombus is not a square as the sides of a square must all be perpendicular to each other while the sides of a rohmbus may not be perpendicular.