A material fails under confined compression loading with stresses $\backslash$sigma $,-\backslash$sigma $,--/,\backslash$sigma $,--2\mathrm{.}0$r$,$ where f: is its uniaxial compressive strength. $($a$)$ Determine the constants c and $\backslash$phi in terms off, for the Mohr$-$Coulomb $($b$)$ Determine the constants k and $\backslash$alpha for the Drucker$-$Prager criterion criterion. $($c$)$ Ilustrate the Mohr$-$Coulomb and Drucker$-$Prager failure surfaces by plotting their cross sections in the $\backslash$pi $-$plane and the meridian section in the meridian plane of $\backslash$theta $-00.($d$)$ Find the largest discrepancy in a deviatoric plane between the Mohr$-$ Coulomb and Drucker$-$Prager criteria. e$)$ Find the tensile strength ft predicted by these two criteria.