Calculate the second moment of area (also known as moment of inertia of plane area, area moment of inertia, or second area moment), polar moment of inertia 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.

A B y y G

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

\( I_{p} = \dfrac {AB^{3}+BA^{3}}{12} \)

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