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# Circular tube

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.

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

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