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Symmetry comes from a Greek word meaning 'to measure together' and is widely used in the study of geometry. Mathematically, symmetry means that one shape becomes exactly like another when you move it in some way: turn, flip or slide.
Square. A square is a regular quadrilateral. All of its angles are equal (90Â°). All of its sides are of equal length. Opposite sides are parallel. The diagonals bisect each other at 90Â°. The diagonals are equal in length. It has 4 lines of symmetry. Order of rotational symmetry: 4.