StefanConstant is the Stefan\[Dash]Boltzmann constant, a universal constant of proportionality between the radiant emittance of a black body and the fourth power of the ...

ThomsonCrossSection is the Thomson cross section, an atomic constant.

VacuumPermeability is the permeability of vacuum, a universal constant.

VacuumPermittivity is the permittivity of vacuum, a universal constant.

Area[polygon] gives the area of polygon polygon, when the edges of polygon have unit length.

CircumscribedRadius[polygon] gives the radius of a circumscribed circle of polygon polygon, when the edges of polygon have unit length.

InscribedRadius[polygon] gives the radius of an inscribed circle of polygon polygon, when the edges of polygon have unit length.

NumberOfEdges[polytope] gives the number of edges of polytope.

NumberOfFaces[polytope] gives the number of faces of polytope.

NumberOfVertices[polytope] gives the number of vertices of polytope.