Determine about which axes will the column possibly buckle having the cross$-$sectional area of figures $1$a and $1b.$ Calculate the critical load $P_{cr}$ around this axis. Length of column; $L=4\mathrm{.}567m,b=23\mathrm{.}45cm,a=2\mathrm{.}345cm,E=12\mathrm{.}34$GPa.

Figure $1$a: Composed section.

Figure $1$b: Composed section.