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, height B and wall thickness C. Use this to calculate deflection or tension in a loaded profile.
\( I_{yy} = \dfrac {AB^{3}-(A-2C)(B-2C)^{3}}{12} \)
\( W_{yy} = \dfrac {AB^{3}-(A-2C)(B-2C)^{3}}{6B} \)