A octagon is a octagon without the same angles as the others.
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A regular octagon will not tessellate but an irregular one can.
a regular octagon has eight sides
Whether it is a regular or irregular octagon does not matter. An octagon is, by definition, a 2-dimensional figure with eight sides, and therefore with eight angles. A regular octagon will have eight equal angles and an irregular octagon will have eight angles some of which are not equal to the others.
A regular octagon has four pairs of parallel lines.
For a regular octagon it is 1080