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If it is a regular 8 sided octagon then it will have 8 lines of symmetry
Different triangles may have none, one, or three lines of symmetry.
There could be many answers to this. If were thinking in terms of geometry: a triangle has between 1 and 3 lines of symmetry a square will always have 4 lines of symmetry. Irregular shapes might have a single line of symmetry. For instance, a building may have a single line of symmetry. a line between two points may only have one line of symmetry. because it is only 2 dimensions, it is impossible for it to have more than one line of symmetry.
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Line symmetry is when a mirror line can be drawn so that each half is a reflection of the other half. The only one of {2, 4, 6, 8} with any possible line symmetry is the 8. Depending upon how it is written, it may have one or two lines of symmetry.