Hello
In the top figure,
Area of blue rectangle = z × 2z = 2z2
Area of orange rectangle = 2z × 8 = 16z
Area of both rectangles = 2z2 + 16z
In the bottom figure,
Area of both rectangles = (z + 8) × 2z = z(2z) + 16z = 2z2 + 16z
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