Writing the total energy as the sum of the internal and the gravitational energies, and writing each using ρ ∼ M/R3 as functions of the total mass and radius, one can derive White Dwarf Radii. The radius of a typical - if a typical one exists - is between 0.008 and 0.02 times the radius of the Sun. Variational Principle: The radius-mass relation for a white dwarf (or any star) can be derived from a variational principle. Given a plot of radius against mass, the student is asked which line on the plot correctly represents the mass-radius relationship for white dwarfs. keywords: white dwarf, mass, radius. swf file: ca_stellarevolution_wdmassradius.swf