It has 8 sides.
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An octagon has eight sides. If it did not have eight sides it would have a different name.
perimeter of octagon is 128 cm= 8 * side side of the octagon=128/8=16 cm
All sides of an octagon are parallel to one other side. There are 4 sets of parallel sides.
I think you mean an octagon, in which case it has 8 sides.
If a regular octagon has a perimeter of 40cm, then each side is 5 cm.