Select a single planar truss system and draw its idealized structural model including its supports. Specify the span and the construction height of the truss system. Show the applied loads and support reactions on the diagram. You can apply loads at the upper chord joints $($e$.$g$.5$ kN at each upper chord joint$)$ as external loadings. Calculate the forces at the members using Cremona method. Show your graphical drawing and indicate whether the forces are in compression or in tension.