I assume you mean sides. All the following have 4 sides:
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it depends on the size of side of the rectangular & square.
No, that's called a similar shape, it has to be both same shape and size, Your Welcome.
A 2 inch by 4 inch, but they are not congruent because they aren't the same size.A congruent shape means the same size and same shape.
Congruent Polygons are the same shape and size.