To state: The common name for a regular hexahedron.

Answer to Problem 13PSC
The common name for hexahedron is cube.
Explanation of Solution
Given Information:
Faces of hexahedron are not triangular.
Hexahedron is a polyhedron with six face.
It does not have any triangular face.
So, if we take six squares and join them all to form a cube.
We get a
So, it is a regular hexahedron.
We know that the solid formed by 6 square surfaces is a cube.
Hence, the common name for regular hexahedron is a cube.
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