If you fold it in half in a way it fill look the same as the other side.
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No.
A regular octagon has 8 line of symmetry.
Yes, its diagonals make axes of symmetry. Also, you can rotate it 180° for symmetry.
A cube.
The numeral V (5) is symetrical. VI (6), VII (7), VIII (8), and IX (9) are not symetrical.