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Length of diameter of circle = Diagonal across shaded square = 12cm
Height of triangle cutting across shaded square = 1/2 of diagonal across shaded square = 6cm
Area of triangle = 0.5 * 12 * 6 = 0.5 * 72 cm²
Area of shaded square = 2 * 0.5 * 72 = 72 cm² #

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