d. [5228 onlyl 3-node triangle elements can often be considered as a "degeneration" of the 4-node quadrilateral element (i.e. as per figure below, two nodes of the quadrilateral overlap or merge into one). Considering the figure below, demonstrate that the approximation of a field U(x) insidea degenerated 4-node quadrilateral, and the 3-node triangle are equivalent 3, 4 3 node triangle 4 node quadrilateral d. [5228 onlyl 3-node triangle elements can often be considered as a "degeneration" of the 4-node quadrilateral element (i.e. as per figure below, two nodes of the quadrilateral overlap or merge into one). Considering the figure below, demonstrate that the approximation of a field U(x) insidea degenerated 4-node quadrilateral, and the 3-node triangle are equivalent 3, 4 3 node triangle 4 node quadrilateral