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area of the shaded part = 2 x [(1/4) x pi x 10 x 10 – (1/2) x 10 x 10)] = 57.1 (correct to 1 dp)
or
area of shaded part = 10 x 10 – 2 x [10 x 10 – (1/4) x pi x 10 x 10)] = 57.1 (correct to 1 dp)

Ans : 57.1 (correct to 1 dp).

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