An octagon is a two-dimensional figure. It has no faces but does have 8 sides.
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An octagon doesn't have any faces: faces only apply to 3-dimensional objects. If you meant edges, or sides, an octagon has eight. If you meant an octagonal prism, they have ten faces.
An octagon has 8 faces and 8 edges. Each face of an octagon is a straight line segment, and each edge is a line segment where two faces meet. The total number of faces and edges in an octagon can be calculated by adding the number of faces and edges together, which equals 16.
8
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An octagon is a plane shape with just one face - an octagonal face! It cannot have triangular faces.