A quadrilateral with no right-angles would be a rhombus (or parallelogram)
A rhombus has four sides, with opposite corner angles equal.
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Any quadrilateral with sides of unique lengths (no two sides with the same length)
trapezium
Its a square because a square has 4 right angles and a QUADrilatiral has 4 sides. also congruent means exactly the same and all four sides of a square are the same.