What do you mean by a "3d hexagon"?
A hexagon is a two dimensional shape with 6 edges.
A hexahedron would be a three dimensional object with 6 faces (a regular one is a cube), and as such has 12 edges.
A 3d hexagon has- drum roll please-8 sides!
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6 of each.
A hexagon is a planar shape, meaning that it is by definition two dimensional. Therefore, there cannot be a 3D hexagon.
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7 faces 12 edges 7 vertices