no it cant be unless you use pentagons and octagons like on a soccer ball
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That is an unbelievably rubbish answer! Tessellation - unless otherwise specified - refers to covering a 2-d surface, not the surface of a sphere. Normal soccer balls do not have pentagons and octagons but pentagons and hexagons.
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An octagon, by itself will not tessellate. In combination with a square it is possible to tessellate a plane.
No.
A octagon is a octagon without the same angles as the others.
a regular octagon has eight sides
A regular octagon will not tessellate but an irregular one can.
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.