The required steps, process, diagrams, and$/$or unknowns are specified below.

The plane truss is shown in Fig. $3.$ The nodal numbers and the global coordinates are indicated in Fig. $3.$ By means of the structural finite element method:

$($a$)$ For each of the inclined supports, draw a diagram, indicate the local coordinates $\{x^{**})$ and $y^{**}-$ axes$)$ and specify the angle $.$

$($b$)$ Determine the transformation matrix, $[T_{\text{i}\text{n}\text{c}\text{l}}].$

$(12$ points$)$

$(6$ points$)$

$($c$)$ Define the nodal$-$displacement vector, $\{D^{**}\}.$ Identify the boundary conditions. If known, specify the corresponding values.

$(6$ points$)$

$3$