Because the sum of where the vertices meet is 270°.
The sum of where the vertices meet needs to be 360° in order for it to tile.
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A regular octagon will not tessellate but an irregular one can.
A octagon is a octagon without the same angles as the others.
An octagon can be used to create a tessellation, but an octagon cannot tessellate on its own.
Octagons is the plural of octagon
An octagon has 8 sides and 8 corners.