What are similar polygons

Polygons whose corresponding angles are congruent and whose corresponding sides are proportional are called similar polygons.

Similar polygons have the same shape. Corresponding angles are equal.

For example 2 squares will be similar. The lengths of the sides may be different though but corresponding sides will be in the same ratio. For example you might have a square of side length 4 and another of sides length 6. They are similar and the ratio of corresponding side is 4/6 or 2/3.