A polygon, by definition is a 2d object. In 3-d it would be a polyhedron.
There are a number of possible answers. One of them is a pyramid with a hendecagon (11-sided) base.
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According to Euler none; for all 3d shapes: Vertices + Faces = Edges + 2 ⇒ 12 + 8 = 19 + 2 ⇒ 20 = 21 So unless 20 does equal 21, no 3d shape has 8 faces, 19 edges and 12 vertices. Any 3d shape with 8 faces would be an octahedron.
Hexagonal prism
It has 6 faces, 12 edges and 8 corners or vertices
There are an infinite number of 3d shapes. For example you can have an infinite number of prisms with ends that are triangular, quadrilateral, or in the shape of any polygon.
A cube is a 3 dimensional figure that has 6 faces, 12 edges and 8 vertices