Answer :

Side of square (r) = 42 cm


In triangle RAB,


RA = RB = 5 cm


In minor sector RQCS angle is 90o


Area of the shaded region = Area of minor sector RQCS + Area of RAB


= + × RA × RB


= + × 5 × 5


= 1384.74 + 12.5


= 1372.24 cm2


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