(a) Describe the terms discrete system and continuous system as used in the modeling of structural engineering problems. Figure 3(a) shows a trapezoidal plate carrying in-plane loading discretised into three (3) triangular constant strain elements. Assemble the global stiffness matrix for this structure if the stiffness matrix for element i is given by Kela Kat Kab' Kac Kbal Kob Koch kcal Ka Kecil a, b, c refer to the nodal numbers of the element and Kaa is a 2 x 2 sub- matrix.. 4 m (7 marks) Figure 3 (a) 4 m 4m (a) Describe the terms discrete system and continuous system as used in the modeling of structural engineering problems. Figure 3(a) shows a trapezoidal plate carrying in-plane loading discretised into three (3) triangular constant strain elements. Assemble the global stiffness matrix for this structure if the stiffness matrix for element i is given by Kela Kat Kab' Kac Kbal Kob Koch kcal Ka Kecil a, b, c refer to the nodal numbers of the element and Kaa is a 2 x 2 sub- matrix.. 4 m (7 marks) Figure 3 (a) 4 m 4m