(i) a quadrilateral?
A square is a quadrilateral because it has four equal sides.
(ii) a parallelogram?
A square is a parallelogram since it has opposite sides equal and parallel.
(iii) a rhombus?
A square is a rhombus because it has all four sides of equal length.
(iv) a rectangle?
A square is a rectangle because its opposite sides are equal and parallel and each angle is right angle.
