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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.
Definition of Reflectional Symmetry. A Reflectional Symmetry is a type of symmetry in which one half of the object is the mirror image of the other. A figure may have both horizontal and vertical lines of reflection.