Calculate the second moment of area (also known as moment of inertia of plane area, area moment of inertia, or second area moment) and the section modulus of a profile with rectangular cross section, width *A* and height *B*. Use this to calculate deflection or stress in a loaded profile.

\( I_{yy} = \dfrac {bh^{3}}{12} \)

\( W_{yy} = \dfrac {bh^{2}}{6} \)