Final answer:
Pairs 1 and 4 are congruent, while pairs 2, 3, and 4 are not.
Step-by-step explanation:
In order to determine which pairs of polygons are congruent, we need to compare their shapes and sizes. Congruent polygons have the same shape and size, meaning that all corresponding angles are congruent and all corresponding sides are equal in length.
Based on this definition, pair 1 and pair 4 are congruent because they have the same shape and size. Pair 2, 3, and 4 are not congruent because they have different shapes and sizes.
Therefore, the correct answer is 'pairs 1 and 4.'