Answer :

A polygon with four congruent sides is a square, or a diamond. This may apply if it also has four right angles.
Another option may be a rhombus, which will apply if it does NOT have any right angles.

Remember: Congruent means the same.

Your answer is a square. 

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Answer:

Rhombus: A quadrilateral with four congruent sides; a rhombus is both a kite and a parallelogram. Rectangle: A quadrilateral with four right angles; a rectangle is a type of parallelogram. Square: A quadrilateral with four congruent sides and four right angles; a square is both a rhombus and a rectangle.

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