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Inthe the two cicles are congruent because their diameterr is equal.(i.e dc=ab=21cm)

area of shaded region=(area of square)-2(area of the semicircle)

=(21×21)-2(π×21²/8)

area of shaded region=94.63.

area of shaded region=(area of square)-2(area of the semicircle)

=(21×21)-2(π×21²/8)

area of shaded region=94.63.