State whether the following pair of polygons are similar or not.

Two polygons of a same number of sides are similar, if

a) all the corresponding angles are equal.

b) all the corresponding sides are in the same ratio (or proportion)

In case of polygons ABCD and PQRS

and ∠A=∠B =∠C =∠D =90° but ∠P ,∠Q ,∠R,∠S≠90°

The corresponding sides of a polygon ABCD and PQRS are proportional, but their corresponding angles are not equal. Hence, polygon ABCD and PQRS are not similar.