Explain how a square is
(i) a quadrilateral
(ii) a parallelogram
(iii) a rhombus
(iv) a rectangle.
(i) A square is 4 sided, so it is a quadrilateral.
(ii) A square has its opposite sides parallel, so it is a parallelogram.
(iii) A square is a parallelogram with all the four sides equal, so it is a rhombus.
(iv) A square is a parallelogram with each angle a right angle, so it is a rectangle.