(i) A square is a quadrilateral, if it has four unequal lengths of sides.
(ii) A square is a parallelogram, since it contains both pairs of opposite sides equal.
(iii) A square is already a rhombus. Since, it has four equal sides and diagonals bisect at 90 to each other.
(iv) A square is a parallelogram, since having each adjacent angle a right angle and opposite sides are equal.

Class 8 Maths Chapter 3 Exercise 3.4 Solution in Video

for more answers vist to:
https://www.tiwariacademy.com/ncert-solutions/class-8/maths/chapter-3/