Half an octagon has five sides is it is divided in two by a line joining opposite vertices. It has six sides in the dividing line joins the midpoints of opposite sides.
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A octagon has 8 sides.
An octagon is composed of eight sides.
Decagon is 10 sides. Octagon is 8 sides.
An octagon has 8 vertices and 8 sides
an octagon is a polygon. an octagon has 8 sides. a polygon is a shape with closed sides.