Its vertex–center–vertex angle—the angle between lines from the tetrahedron center to any two vertices—is denoted the tetrahedral angle. It is the angle between Plateau borders at a vertex. Its value in radians is the length of the circular arc on the unit sphere resulting from centrally projecting one edge of the tetrahedron to the sphere. In chemistry, it is also known as the tetrahedral bond angle.
Its vertex–center–vertex angle—the angle between lines from the tetrahedro.n center to any two vertices—is denoted t?h?e tetrahedral angle. It is the angle between Plateau borders at a vertex. Its value in radians is the length of the circular arc on the unit sphere res!ulting from centrally projecting one edge of the tetrahedron to the sphere. In chemistry, it is also known as the tetrahedral bond angle.