Editing Magic constant (section)

==Moment of inertia==
In the mass model, the value in each cell specifies the mass for that cell.<ref name="Heinz">Heinz http://www.magic-squares.net/ms-models.htm#A 3 dimensional magic square/</ref>  This model has two notable properties.  First it demonstrates the balanced nature of all magic squares.  If such a model is suspended from the central cell the structure balances.  (consider the magic sums of the rows/columns .. equal mass at an equal distance balance).  The second property that can be calculated is the [[moment of inertia]]. Summing the individual moments of inertia (distance squared from the center × the cell value) gives the moment of inertia for the magic square, which depends solely on the order of the square.<ref name="Ivars Peterson">Peterson http://www.sciencenews.org/view/generic/id/7485/description/Magic_Square_Physics/</ref>