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BC=12

CD=18

BD=30

Area of quadrant = 400pi

Area of trapezium = 0.5(30 + 40)×28=980

Area of triangle = 0.5×12×30=180

Area of shaded part = 400pi – 980 – 180 = 96.64 cm² (to 2 decimal places) 

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Should be 96.64 cm²

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