zero, for any tetrahedron, not just regular
A tetrahedron has 4 faces.
A tetrahedron has four faces.
A tetrahedron has 4 faces.
A tetrahedron has four vertices.
A Tetrahedron has 4 vertices
A tetrahedron has 6 edges.
There are 4 vertices does the tetrahedron have
A tetrahedron has 4 vertices.
It has 1,345,890 diagonals
There are 14 angles in a tetrahedron
A tetrahedron need not have any verticals.