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.
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.
It has infinitely many sizes.
Do you mean sides? That's 8. If you mean sizes, as you spelled it, then a given octagon has only one size, but the shape generally referred to as an "octagon" can have an infinite number of sizes.
An octagon is a plan figure with eight sizes, a regular octagon is an octagon with all the eight sizes being equal to each other
An octagon is a polygon with eight sides.
Regular octagons have equal sides.
It is an irregular 8 sided octagon
An octagon has 8 sides.
An octagon has 8 vertices.
An octagon has 8 edges
An octagon has 8 vertices.
An octagon has eight sides.
there are three rhombuses in an octagon.