A$32-$in$.-$wide$$by$0\mathrm{.}125-$in$.-$thick$$by$110-$in$.-$long$$steel$$sheet$$is$$to$$be$$formed$$into$$a$$hollow$$section$$by$$being$$bent$$through$360\backslash$deg $$and$$having$$the$$long$$edges$$welded$($i$.$e$.,$butt$-$welded$)$together$.$Assume$$a$$cross$-$sectional$$medial$$length$$of$32$in$.($no$$stretching$$of$$the$$sheet$$due$$to$$bending$).$If$$the$$maximum$$shear$$stress$$must$$be$$limited$$to$19$ksi$,$determine$$the$$maximum$$torque$$that$$can$$be$$carried$$by$$the$$hollow$$section$$if$($a$)$the$$shape$$of$$the$$section$$is$$a$$circle$.($b$)$the$$shape$$of$$the$$section$$is$$an$$equilateral$$triangle$.($c$)$the$$shape$$of$$the$$section$$is$$a$$square$.($d$)$the$$shape$$of$$the$$section$$is$$a$$rectangle$$measuring$9\mathrm{.}6$x$6\mathrm{.}4$in