An octagon is a two-dimensional shape.
Zero
An octagon has eight sides.
An Octagon has 8 sides
An octagon has 8 angles.An octagon has 8 angles.An octagon has 8 angles.An octagon has 8 angles.
None, if it is an irregular octagon.
Zero
It has 3 demensions
one or two or three or four
An octagon has 8 sides.
An octagon has 8 vertices.
An octagon has 8 vertices.
An octagon has 8 edges
there are three rhombuses in an octagon.
An octagon has eight sides.
An Octagon has 8 sides
An octagon has 8 angles.An octagon has 8 angles.An octagon has 8 angles.An octagon has 8 angles.
If you mean vertices, there are eight in an octagon.