There is no sensible answer. A regular polygon with n sides has n lines of symmetry, and n can be increased without limit. However, as n approaches infinity, the polygon approaches a circle and a circle is not a polygon.
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A triangle has 3 lines of symmetry.
a polygon
A square has four lines of symmetry!
A polygon with 14 sides can have at most 14 lines of symmetry. This would occur if the polygon was a regular polygon (i.e. all its sides would have to be equal and all its angles would have to be equal). The lines of symmetry would run between the midpoints of opposite sides and between opposite vertices.
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