Question

Give reasons for the following:
(a) A square can be thought of as a special rectangle.
(b) A rectangle can be thought of as a special parallelogram.
(c) A square can be thought of as a special rhombus.
(d) Squares, rectangles, parallelograms are all quadrilateral.
(e) Square is also a parallelogram. 

Answer 1

(a) Because it's all angles are right angle and opposite sides are equal. 
(b) Because its opposite sides are equal and parallel. 
(c) Because its four sides are equal, and diagonals are perpendicular to each other.
(d) Because all of them have four sides. 
(e) Because its opposite sides are equal and parallel.