Theory of Structures
In case of principal axes of a section

Difference of moment inertia is zero
None of these
Sum of moment of inertia is zero
Product of moment of inertia is zero

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Theory of Structures
Slenderness ratio of a long column, is

Area of cross-section divided by radius of gyration
Radius of gyration divided by area of cross-section
Area of cross-section divided by least radius of gyration
Length of column divided by least radius of gyration

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