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A shape with four sides and three vertices does not exist in Euclidean geometry. In Euclidean geometry, a shape must have the same number of sides as vertices. Therefore, a shape with four sides would have four vertices.
An octagon has eight sides and eight vertices. An octagon has 8 sides and 8 vertices.
8 sides 8 vertices
A cube.
An octagon has 8 vertices and 8 sides