Figure show two first-order triangular finite elements used to solve the Laplace equation for electrostatic potential. Find a local S-matrix for each triangle, and a global S-matrix for the mesh which consists of just these two triangles. The local (disjoint) and global (conjoint) node-numberings are shown in Figure (a) and (b), respectively. Also, Figure (a) shows the (x, y)-coordinates of the element vertices in meters.