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 circular cross section, diameter *A* and wall thickness *B*. Use this to calculate deflection or tension in a loaded profile.

\( I_{yy} = \dfrac {π(A^{4}-(A-2B)^{4})}{64} \)

\( W_{yy} = \dfrac {π(A^{4}-(A-2B)^{4})}{32A} \)