A hexagon is a 2d shape with six sides, a hexahedron is a 3d shape with six faces.
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Hexahedron is to hexagon as pentahedron is to pentagon.
hexahedron is the name of a 3d hexagon
http://en.wikipedia.org/wiki/Hexahedron Generally, a hexahedron is any polyhedron with six faces, most commonly a cube. No hexahedron has a hexagon for any of its faces; most have squares or triangles.
A two dimensional figure with 6 sides is a hexagon. 3d=>hexahedron
The answer depends on how many of the 5 to 8 vertices of the hexagon are truncated.