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not all shapes have lines of symmetry. one example is a triangle.
A square has 4 lines of symmetry
Three dimensional shapes, generally, don't have lines of symmetry, but a circle has an infinite number is symmetry lines. 3D shapes also don't have rotational symmetry either, but a circle has an infinite number of that as well.
Most of them.
It all depends what types of shapes, but take for example a circle, it can have multiple lines of symmetry.