Theory of Structures
Y are the bending moment, moment of inertia, radius of curvature, modulus of If M, I, R, E, F, and elasticity stress and the depth of the neutral axis at section, then

M/I = E/R = F/Y
I/M = R/E = F/Y
M/I = R/E = F/Y
M/I = E/R = Y/F

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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
Radius of gyration divided by area of cross-section
Area of cross-section divided by radius of gyration

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