Geometric figures are congruent if they are the same size, dimension, and type. Corresponding angles and corresponding sides are in the same position in polygons with an equal number of sides
Two polygons are congruent polygons if and only if their corresponding sides are congruent. Thus triangles that are the same size and shape are congruent.
When you write a congruence statement for two polygons always list the corresponding vetcies in the same order.