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## Homework Statement

In this question, we are interested inthe buckling of column, so we should calculate the moment of inertia (Ixx) or (Iyy) at the column,right?

## Homework Equations

## The Attempt at a Solution

Why the author calculate (Ixx) and (Iyy) using the cross sectional area of beam?

is it wrong?

And for critical load applied at y-axis (Pcr_y) , why the Le used is 3000 , why not 250mm?[/B]