8 The figure shows the first four rectangles in a pattern. Describe the iterative process used to create the pattern. للطبيب Describe what happens to the amount of unshaded area in each stage of the process. As the iterative process continues in the figure, what happens to the area of the unshaded part of each rectangle? If the base of the original rectangle is 2a units long and its height is a units long, then write the first four terms in the sequence that represents the unshaded area at each stage. (e) Write a formula using sigma notation for the total of the unshaded region in the sequence of figures assuming the pattern continues to Stage n.