An octagon can be either regular or irregular. A regular octagon in a 2-dimensional closed figure with eight sides, all of which are the same length. This means that all the angles are the same, too. An irregular octagon is a 2-dimensional closed figure with eight sides, but at least two of the sides are of different length. All sides can be of different lengths.
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A regular octagon will not tessellate but an irregular one can.
An octagon is a two-dimensional polygon with eight sides which can be regular or irregular
A regular octagon will not tessellate but an irregular one can.
It is a shape that has 8 sides but does not look like a regular octagon. As long as it has 8 sides it is an irregular octagon.
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.