Four
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If the question refers to an octagon, rather than an octogan, it can have 8 lines of symmetry although it need not have any.
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I have no idea about an octogan. An octagon can have none, one, two, up to 8 lines of symmetry.
A regular octogan has 8 lines of symetry, and a irregular octogan has 2 lines of symetry.
A regularpentagon has 5 lines of symmetryAny pentagon could have less and so can have up to 5 lines of symmetry.
A right angle has one line of symmetry.
2 lines of symmetry