Theory of Structures
At any point of a beam, the section modulus may be obtained by dividing the moment of inertia of the section by

Depth of the neutral axis
Maximum compressive stress at the section
Maximum tensile stress at the section
Depth of the section

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Theory of Structures
Slenderness ratio of a long column, is

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

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