... the second moment of area at 0. On one of the axes is themaximum second moment of area, and the minimum second moment of areais on the other axis. These axes are called the principal axes.With ... 2.20). The sum of the second moments of area is constant for anyreference with origin at O. The minimum second moment of area corre-sponds to an axis at right angles to the axis having the maximum ... IxxX 2X22The angle a0corresponds to an extreme value of IxHxH(i.e., to a maximum orminimum value). There are two possible values of 2a0, which are p radiansapart, that will satisfy...