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

Nonagon is a regular polygon with nine edges, for use with polytope functions.

Octagon is a regular polygon with eight edges, for use with polytope functions.

Pentagon is a regular polygon with five edges, for use with polytope functions.

Undecagon is a regular polygon with eleven edges, for use with polytope functions.

Vertices[polytope] gives a list of the vertex coordinates of polytope.

FindIons[wavelength_1, wavelength_2] gives the resonance absorption lines in the wavelength range between wavelength_1 to wavelength_2.

WavelengthAbsorptionMap[wavelength_1, wavelength_2] generates a plot of the absorption map in the wavelength range between wavelength_1 and wavelength_2.

DynamicViscosity[altitude] gives the coefficient of dynamic viscosity at the specified altitude altitude.

GravityAcceleration[altitude] gives the 45-degree-latitude acceleration of gravity at the specified altitude altitude.