20. Draw parallelogram ABCD. Let AC and BD intersect at E. Let u = AD and v = BA Express the following in terms of u and v. [4 marks] a) CE Diagram and rough work b DE - DA + EB Application [20 marks] 21. Vertices A(a, -7, 2), B(5, b, -9), C(3, 5, c), D(-2, -5, 12) form a parallelogram. a) Draw a simple diagram, and determine the values of a, b, and c. [3] b) Determine the exact area of the parallelogram. [3]