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total area of the shaded part = (20 x 20) – (20 x 20 – pi x 10 x 10)/2 – [(1/4) x pi x 20 x 20 – (1/2) x 20 x 20] x 2 = 128.8 (correct to 1 decimal place)

Ans : 128.8 sq cm.

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