A two$-$bar planar truss structure has the geometry as shown in Figure Q$1.$ A concentrated force $P=200kN$ is applied to the truss at joint C $,$ in the direction shown. Member AC is made of steel $)=(200$GPa and has cross$-$sectional area of $1200m{m}^2$ while member BC is made of aluminum $)=(70$GPa with cross$-$sectional area of $1500m{m}^2.$ By using point $A,B,$ and C as node $1,2,$ and $3,$ respectively, the nodal coordinates and the elements connectivity are chosen as shown in the following tables:

$\backslash$table$[[$NODAL COORDINATES$],[$NODE$,x(m),y(m)$