[
  "Total area of both shapes = triangle + rectangle = 192 + 432 = 624 cm^2.",
  "The shaded overlap (36 cm^2) is counted in both. Subtract it once: 624 - 36 = 588 cm^2.",
  "Unshaded = total figure area - shaded = 588 - 36 = 552 cm^2."
]