Q$3)$ In the truss system

a$)$ Find member forces $V_2,U_2$ and $O_3($via Ritter Method for $U_2$ and $O_3)$

b$)$ Give size to $V_2,U_2$ and $O_3.U_2{?}_{?}$ is circular hollow section, $O_3$ square hollow section, $V_2$ is double angles$*.$ Initially $100$ will be taken for compressive forces $($If normal stress is very low, you can increase $).0\mathrm{.}001$ limitation is under consideration for tensile members. $)=L,K=(1)=(140$MPa.

Attention : There exists $1cm$ space between two angles $($consider there is a plate between angles, but not continuous$).$