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Polar moment of ineria ERROR

Question asked by Eyal Sh on Aug 22, 2017
Latest reply on Aug 24, 2017 by Hari Padmanabhan

When I use 'Section Properties' to calculate the polar moment of inertia (i.e. the object's ability to resist torsion) of a shape that is NOT circular the sold gives me an answer the doesn't mach the textbook calculation.

For example when I calculate the MOI of a square (10x10mm) the solid says it's 1666.6mm^4 and according to the textbooks it's 10^4 X 0.141 = 1410mm^4

Why does it happens and how can see the object's ability to resist torsion?