An eight-sided plane figure is an octagon. If the sides are all the same length, and the angles are all equal, it is a regular octagon.
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An octagon has 8 sides.
An 8 sided shape is an octagon
A shape with 8 sides is an octagon.
An 8 sided shape is an octagon
An heptagon has 7 corners and 7 sides whereas an octagon has 8 corners and 8 sides