An infinite number of sizes. Start off with any octagon. Multiply each of its sides by any number x (>0). That will give a similar octagon that is x times as large. The number of such octagons then is equal to the number of possible values for x, ie infinite.
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An octagon is a polygon with eight sides.
octagon has eight sides
A regular octagon has 8 sides.
A regular octagon has 8 lines of symmetry.
An octagon has 8 sides. "Octa" is Greek for eight.