A decahedron has no cornets.
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A decahedron has ten faces.
10
Normally 45.
In geometry, a decahedron is a polyhedron with ten faces. There are 32300 topologically distinct decahedra and none are regular, so this name is ambiguous.One regular decahedron is an octagonal prism. Along with its 10 faces, it has 16 vertices and 24 edges.
A decahedron is a solid shape with ten flat faces.