A regular octagon will not tessellate but an irregular one can.
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A plane figure with eight sides is an octagon.
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.
No.
An octagon is a plane shape with just one face - an octagonal face! It cannot have triangular faces.
It's called an Octagon.