[
  "Shaded rectangle: perimeter 22 cm gives length + breadth = 11. Its breadth matches the identical rectangles = 5 cm, so its length = 6 cm.",
  "From the figure's alignment, find the length of each identical rectangle (= 12 cm).",
  "Total area = 8 x (12 x 5) + (6 x 5) = 480 + 30 = 510 cm^2."
]