The 8 interior angles of an 8 sided octagon add up to 1080 degrees
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A regular octogan has 8 lines of symetry, and a irregular octogan has 2 lines of symetry.
I have no idea about an octogan. An octagon can have none, one, two, up to 8 lines of symmetry.
Eight.
8
Four * * * * * If the question refers to an octagon, rather than an octogan, it can have 8 lines of symmetry although it need not have any.