Question

Which pairs of polygons are congruent?

Answer 1

Answer: The polygons are congruent when they are the mirror image of each other. They are equal in shape and size. They have equal number of sides. All the corresponding sides and corresponding angles are equal.  It is different from similar polygons which have same shape but not necessary to have same size.

Answer 2

Congruent means the same so all you need to do is find the pair of polygons that look identical or the same.