It's kind of obvious seeing as 'oct' means eight...
Anyway, there are eight straight lines in an octagon.
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6 straight lines drawn inside of an octagon will divide the octagon into 8 triangles
An octagon has 8 lines of reflective symmetry.
An octagon is an eight-sided figure.
I believe that an octagon has 16 lines of symmetry.
16 * * * * * Not sure what a rectangular octagon is but no kind of octagon has more than 8 lines of symmetry.