None.
zero, for any tetrahedron, not just regular
A tetrahedron has 4 faces.
A tetrahedron has 4 faces.
A tetrahedron has four faces.
A tetrahedron has 4 vertices.
A tetrahedron has four vertices.
A tetrahedron has 6 edges.
A Tetrahedron has 4 vertices
There are 4 vertices does the tetrahedron have
It has 1,345,890 diagonals
There are 14 angles in a tetrahedron
One: a tetrahedron is a single solid.