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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.
A line of symmetry can be thought of as the line where you could cut a shape (or a line or any object) and it would look the exact same on both sides. An example of a shape wi â¦ th exactly two lines of symmetry would be a rectangle.   A square also has at least two lines of symmetry, but it actually has four total. 3 people found this useful.