Problem $6\mathrm{.}33.$ Two long slender pin$-$ended bars, one of solid circular cross$-$section $50\mathrm{.}8$ mm

dia. and the other of solid square cross$-$section but of the same cross$-$sectional area as the circular bar

are subjected to centrally applied axial compressive load. The bars are of the same length and are

made of the same material. Using Euler column theory, compare their buckling strength.