An octagon is any 8-sided 2-dimensional figure. It can be any size, so it can have any number of millimeters.
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An octagon has eight sides.
An Octagon has 8 sides
An octagon has 8 angles.An octagon has 8 angles.An octagon has 8 angles.An octagon has 8 angles.
A octagon has 8 sides.
None, if it is an irregular octagon.